Mono build: use release_debug target for debug templates (#2937)

See godotengine/godot#33699.

(cherry picked from commit 569628e17ed7b8c90d3d42e4e8574f96b3af2c48)

development/compiling/compiling_with_mono.rst

@@ -123,7 +123,7 @@ Example (Windows)
     # Editor
     scons p=windows target=release_debug tools=yes module_mono_enabled=yes
     # Export templates
-    scons p=windows target=debug tools=no module_mono_enabled=yes
+    scons p=windows target=release_debug tools=no module_mono_enabled=yes
     scons p=windows target=release tools=no module_mono_enabled=yes
 
 Example (X11)
@@ -139,7 +139,7 @@ Example (X11)
     # Editor
     scons p=x11 target=release_debug tools=yes module_mono_enabled=yes
     # Export templates
-    scons p=x11 target=debug tools=no module_mono_enabled=yes
+    scons p=x11 target=release_debug tools=no module_mono_enabled=yes
     scons p=x11 target=release tools=no module_mono_enabled=yes
 
 .. _compiling_with_mono_data_directory:
@@ -159,7 +159,7 @@ Export templates
 
 The name of the data directory for an export template differs based on the
 configuration it was built with. The format is
-``data.mono.<platform>.<bits>.<target>``, e.g. ``data.mono.x11.32.debug`` or
+``data.mono.<platform>.<bits>.<target>``, e.g. ``data.mono.x11.32.release_debug`` or
 ``data.mono.windows.64.release``.
 
 This directory must be placed with its original name next to the Godot export