Fix typos with codespell

Using codespell 2.0.0.

Method:
```
$ cat > ../godot-word-whitelist.txt << EOF
ang
curvelinear
dof
doubleclick
fave
findn
GIRD
leapyear
lod
merchantibility
nd
numer
ois
ony
que
seeked
synching
te
uint
unselect
webp
EOF

$ codespell -w -q 3 -I ../godot-word-whitelist.txt --skip="./thirdparty,*.po"
$ git diff // undo unwanted changes
```

1 files changed, 1 insertions, 1 deletions

diff --git a/editor/plugins/tiles/tile_set_editor.cpp b/editor/plugins/tiles/tile_set_editor.cpp
index 8a5890e9a4..5573fae670 100644
--- a/editor/plugins/tiles/tile_set_editor.cpp
+++ b/editor/plugins/tiles/tile_set_editor.cpp
@@ -76,7 +76,7 @@ void TileSetEditor::drop_data_fw(const Point2 &p_point, const Variant &p_data, C
 			tile_set_atlas_source_editor->init_source();
 		}
 
-		// Update the selected source (thus trigerring an update).
+		// Update the selected source (thus triggering an update).
 		_update_atlas_sources_list(source_id);
 	}
 }