RELEASE_README: add disk usage considerations section

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-docs/-/merge_requests/95>

scripts/RELEASE_README.md

@@ -1,6 +1,6 @@
 # GStreamer documentation
 
-This is the released version of the [GStreamer documentation](https://cgit.freedesktop.org/gstreamer/gst-docs), it contains
+This is the released version of the [GStreamer documentation](https://gitlab.freedesktop.org/gstreamer/gst-docs), it contains
 two folders:
 
 * html/: The static website documentation which can be hosted anywhere and
@@ -8,3 +8,25 @@ two folders:
 * devhelp/: The documentation to be browsed with [devhelp](https://wiki.gnome.org/Apps/Devhelp).
             The content of that folder should be installed in `/usr/share/gtk-doc/html/GStreamer-@GST_API_VERSION@/`
             by documentation packages.
+
+## Disk usage considerations
+
+Both folders contain a "search" folder made up of a large amount
+of very small files (50 K+). This can cause the unpacked size of both
+these folders to grow up to 500 MB+ on filesystems that weren't
+configured for such a use case (eg `mkfs.ext4 -Tnews`).
+
+It is safe to remove these search folders, this will simply cause
+the search box to be hidden when viewing the documentation.
+
+If packages are produced both for the devhelp and html folders,
+one may choose to remove the search folders for devhelp, as
+devhelp exposes a (more limited) search feature, and keep the
+search folder in the html package, so that users of the package
+can replicate the behaviour of the online documentation with
+the offline version.
+
+Choosing to strip the search folders in both, either or neither
+package is ultimately left to the packagers' discretion, users
+of most distributions should usually have enough disk space
+to accomodate these.