docs: Fix line numbers in tutorials 1 and 2

It seems that the lines for the C code for tutorials 1 and 2 are all
off.

The remaining tutorials seem uneffected.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5387>

subprojects/gst-docs/markdown/tutorials/basic/concepts.md

@@ -76,7 +76,7 @@ We will skip GStreamer initialization, since it is the same as the
 previous tutorial:
 
 {{ C+JS_FALLBACK.md }}
-  {{ tutorials/basic-tutorial-2.c[13:16] }}
+  {{ tutorials/basic-tutorial-2.c[17:20] }}
 {{ END_LANG.md }}
 
 {{ PY.md }}
@@ -97,7 +97,7 @@ more meaningful debug output). If you pass [NULL] for the name, however,
 GStreamer will provide a unique name for you.
 
 For this tutorial we create two elements: a [videotestsrc] and
-an [autovideosink]. There are no filter elements. Hence, the pipeline would 
+an [autovideosink]. There are no filter elements. Hence, the pipeline would
 look like the following:
 
 ![](images/basic-concepts-pipeline.png)
@@ -118,7 +118,7 @@ platform-independent.
 ### Pipeline creation
 
 {{ C+JS_FALLBACK.md }}
-  {{ tutorials/basic-tutorial-2.c[17:19] }}
+  {{ tutorials/basic-tutorial-2.c[21:23] }}
 {{ END_LANG.md }}
 
 {{ PY.md }}
@@ -130,7 +130,7 @@ before they can be used, because it takes care of some clocking and
 messaging functions. We create the pipeline with [gst_pipeline_new]\().
 
 {{ C+JS_FALLBACK.md }}
-  {{ tutorials/basic-tutorial-2.c[25:32] }}
+  {{ tutorials/basic-tutorial-2.c[29:36] }}
 {{ END_LANG.md }}
 
 {{ PY.md }}
@@ -184,28 +184,28 @@ properties) or inquired to find out about the element's internal state
   let us assume we have a Gst Element `source` with a property `pattern`
 
   The current state of a property can be fetched by either:
-  1. Accessing the property as an attribute of the `props` attribute of an 
+  1. Accessing the property as an attribute of the `props` attribute of an
   element. Ex: `_ = source.props.pattern` to print it on the screen
-  2. Using the `get_property` method of the element. 
+  2. Using the `get_property` method of the element.
   Ex: `_ = source.get_property("pattern")`
 
   And properties can be set by one of three methods:
-  1. Setting the property as an attribute of the `props` attribute. 
+  1. Setting the property as an attribute of the `props` attribute.
   Ex: `source.props.pattern = 1` or equivalently `source.props.pattern="snow"`
-  2. Using the `set_property` method of the element. 
+  2. Using the `set_property` method of the element.
   Ex: `source.set_property("pattern", 1)` or equivalently `source.set_property("pattern", "snow")`
   3. Using the `Gst.util_set_object_arg()` method. This mode also allows you to
-  pass Gst Caps and other structures. Ex: `Gst.util_set_object_arg(source, "pattern", "snow")`, 
+  pass Gst Caps and other structures. Ex: `Gst.util_set_object_arg(source, "pattern", "snow")`,
   or equivalently, `Gst.util_set_object_arg(source, "pattern", 1)`
 
-  Note: In all three methods of setting a property, if a string is passed as 
+  Note: In all three methods of setting a property, if a string is passed as
-  the value to set, it has to be the serialized version of a flag or value 
+  the value to set, it has to be the serialized version of a flag or value
   (using [gst_value_serialize]\())
 {{ END_LANG.md }}
 
-Coming back to what's in the example above, 
+Coming back to what's in the example above,
 {{ C+JS_FALLBACK.md }}
-  {{ tutorials/basic-tutorial-2.c[33:35] }}
+  {{ tutorials/basic-tutorial-2.c[37:39] }}
 {{ END_LANG.md }}
 
 {{ PY.md }}
@@ -229,7 +229,7 @@ of the tutorial is very similar to the previous one, but we are going to
 add more error checking:
 
 {{ C+JS_FALLBACK.md }}
-  {{ tutorials/basic-tutorial-2.c[36:43] }}
+  {{ tutorials/basic-tutorial-2.c[40:47] }}
 {{ END_LANG.md }}
 
 {{ PY.md }}
@@ -242,7 +242,7 @@ details are given in [Basic tutorial 3: Dynamic
 pipelines].
 
 {{ C+JS_FALLBACK.md }}
-  {{ tutorials/basic-tutorial-2.c[44:75] }}
+  {{ tutorials/basic-tutorial-2.c[48:79] }}
 {{ END_LANG.md }}
 
 {{ PY.md }}
@@ -354,4 +354,4 @@ It has been a pleasure having you here, and see you soon!
   [GError]: GError
   [vertigotv]: vertigotv
   [videoconvert]: videoconvert
-  [gst_pipeline_new]: gst_pipeline_new
+  [gst_pipeline_new]: gst_pipeline_new

subprojects/gst-docs/markdown/tutorials/basic/hello-world.md

@@ -75,7 +75,7 @@ See how [Basic tutorial 12: Streaming] solves this issue.
 Let's review these lines of code and see what they do:
 
 {{ C+JS_FALLBACK.md }}
- {{ tutorials/basic-tutorial-1.c[9:11] }}
+ {{ tutorials/basic-tutorial-1.c[13:15] }}
 {{ END_LANG.md }}
 
 {{ PY.md }}
@@ -98,7 +98,7 @@ benefit from the GStreamer standard command-line options (more on this
 in [Basic tutorial 10: GStreamer tools])
 
 {{ C+JS_FALLBACK.md }}
-  {{ tutorials/basic-tutorial-1.c[13:17] }}
+  {{ tutorials/basic-tutorial-1.c[16:21] }}
 {{ END_LANG.md }}
 
 {{ PY.md }}
@@ -155,7 +155,7 @@ only thing we are doing in this example is exiting on error, so do not
 expect much feedback.
 
 {{ C+JS_FALLBACK.md }}
- {{ tutorials/basic-tutorial-1.c[18:20] }}
+ {{ tutorials/basic-tutorial-1.c[22:24] }}
 {{ END_LANG.md }}
 
 {{ PY.md }}
@@ -172,7 +172,7 @@ In this line, [gst_element_set_state]\() is setting `pipeline` (our only
 element, remember) to the `PLAYING` state, thus initiating playback.
 
 {{ C+JS_FALLBACK.md }}
-  {{ tutorials/basic-tutorial-1.c[21:26] }}
+  {{ tutorials/basic-tutorial-1.c[25:30] }}
 {{ END_LANG.md }}
 
 {{ PY.md }}
@@ -198,7 +198,7 @@ Before terminating the application, though, there is a couple of things
 we need to do to tidy up correctly after ourselves.
 
 {{ C+JS_FALLBACK.md }}
-  {{ tutorials/basic-tutorial-1.c[27:33] }}
+  {{ tutorials/basic-tutorial-1.c[37:43] }}
 
   Always read the documentation of the functions you use, to know if you
   should free the objects they return after using them.
@@ -268,4 +268,4 @@ It has been a pleasure having you here, and see you soon!
   [gst_parse_launch]: gst_parse_launch
   [playbin]: playbin
   [gst-launch-1.0]: tools/gst-launch.md
-  [GST_STATE_NULL]: GST_STATE_NULL
+  [GST_STATE_NULL]: GST_STATE_NULL