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/scene/gui/graph_node.cpp b/scene/gui/graph_node.cpp
index 7771970a22..1ca54a16ae 100644
--- a/scene/gui/graph_node.cpp
+++ b/scene/gui/graph_node.cpp
@@ -228,7 +228,7 @@ void GraphNode::_resort() {
 	}
 
 	stretch_avail += stretch_diff - sb->get_margin(SIDE_BOTTOM) - sb->get_margin(SIDE_TOP); //available stretch space.
-	/** Second, pass sucessively to discard elements that can't be stretched, this will run while stretchable
+	/** Second, pass successively to discard elements that can't be stretched, this will run while stretchable
 		elements exist */
 
 	while (stretch_ratio_total > 0) { // first of all, don't even be here if no stretchable objects exist