docs: fix up basesrc/basesink docs formatting

libs/gst/base/gstbasesink.c

@@ -52,7 +52,7 @@
  *       "Sink name",
  *       "Sink",
  *       "My Sink element",
- *       "The author <my.sink@my.email>");
+ *       "The author &lt;my.sink@my.email&gt;");
  * }
  * ]|
  *

libs/gst/base/gstbasesrc.c

@@ -123,10 +123,10 @@
  *       gst_static_pad_template_get (&srctemplate));
  *
  *   gst_element_class_set_static_metadata (gstelement_class,
- *      "Sink name",
- *      "Sink",
- *      "My Sink element",
- *      "The author <my.sink@my.email>");
+ *      "Source name",
+ *      "Source",
+ *      "My Source element",
+ *      "The author &lt;my.sink@my.email&gt;");
  * }
  * ]|
  *