Document relative paths in .gdextension files being supported

- Mention support for comments in `.gdextension` files.
- List recommended import options for GDExtension icons.

Author: Calinou

tutorials/scripting/gdextension/gdextension_file.rst

@@ -50,9 +50,10 @@ Here is an example of what that can look like:
 
 .. code-block:: none
 
+    ; A comment line starts with a semicolon. This line is ignored by the engine.
     [libraries]
 
-    macos.debug = "res://bin/libgdexample.macos.template_debug.framework"
+    macos.debug = "res://bin/libgdexample.macos.template_debug.framework" ; Inline comments are also allowed.
     macos.release = "res://bin/libgdexample.macos.template_release.framework"
     windows.debug.x86_32 = "res://bin/libgdexample.windows.template_debug.x86_32.dll"
     windows.release.x86_32 = "res://bin/libgdexample.windows.template_release.x86_32.dll"
@@ -65,6 +66,12 @@ Here is an example of what that can look like:
     linux.debug.rv64 = "res://bin/libgdexample.linux.template_debug.rv64.so"
     linux.release.rv64 = "res://bin/libgdexample.linux.template_release.rv64.so"
 
+.. tip::
+
+    While absolute ``res://`` paths are shown in the above example, relative paths
+    like ``bin/libgdexample.linux.template_debug.x86_64.so`` are also allowed.
+    Relative paths can be used to ensure the extension successfully loads
+    regardless of which folder it was installed in.
 
 Entries are matched in order, so if two sets of feature tags could match
 the same system, be sure to put the more specific ones first:
@@ -138,8 +145,8 @@ Architecture
 Icons section
 -------------
 
-By default, Godot uses the Node icon in the scene dock for GDExtension nodes. A custom icon can be
-set by reference to its name and resource path of an SVG file.
+By default, Godot uses the Node icon in the scene dock for GDExtension nodes.
+A custom icon can be set by reference to its name and resource path of an SVG file.
 
 For example:
 
@@ -149,7 +156,14 @@ For example:
 
     GDExample = "res://icons/gd_example.svg"
 
-The path should point to a 16 by 16 pixel SVG image. Read the guide for :ref:`creating icons <doc_editor_icons>`
+The path should point to a 16×16 pixel SVG image, with two options enabled on the
+image in the Import dock:
+
+- **Editor > Scale with Editor Scale**.
+- **Editor > Convert Colors with Editor Theme**.
+
+Enabling both options ensures the icon behaves as closely as possible to
+the stock editor icons. Read the guide for :ref:`creating icons <doc_editor_icons>`
 for more information.
 
 Dependencies section