Fix typos with codespell

Using codespell 1.14.0.

Method:
```
$ cat > ../godot-word-whitelist.txt << EOF
ang
doubleclick
lod
nd
numer
que
te
unselect
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/servers/visual/shader_language.h b/servers/visual/shader_language.h
index acc3297bed..67c273d267 100644
--- a/servers/visual/shader_language.h
+++ b/servers/visual/shader_language.h
@@ -646,7 +646,7 @@ private:
 		const DataType args[MAX_ARGS];
 	};
 
-	struct BuiltinFuncOutArgs { //arguments used as out in built in funcions
+	struct BuiltinFuncOutArgs { //arguments used as out in built in functions
 		const char *name;
 		int argument;
 	};