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, 2 insertions, 1 deletions

diff --git a/scene/resources/visual_shader.h b/scene/resources/visual_shader.h
index a0e3bdf166..841672294e 100644
--- a/scene/resources/visual_shader.h
+++ b/scene/resources/visual_shader.h
@@ -255,7 +255,8 @@ public:
 	virtual String generate_global(Shader::Mode p_mode, VisualShader::Type p_type, int p_id) const;
 	virtual String generate_global_per_node(Shader::Mode p_mode, VisualShader::Type p_type, int p_id) const;
 	virtual String generate_global_per_func(Shader::Mode p_mode, VisualShader::Type p_type, int p_id) const;
-	virtual String generate_code(Shader::Mode p_mode, VisualShader::Type p_type, int p_id, const String *p_input_vars, const String *p_output_vars, bool p_for_preview = false) const = 0; //if no output is connected, the output var passed will be empty. if no input is connected and input is NIL, the input var passed will be empty
+	// If no output is connected, the output var passed will be empty. If no input is connected and input is NIL, the input var passed will be empty.
+	virtual String generate_code(Shader::Mode p_mode, VisualShader::Type p_type, int p_id, const String *p_input_vars, const String *p_output_vars, bool p_for_preview = false) const = 0;
 
 	virtual String get_warning(Shader::Mode p_mode, VisualShader::Type p_type) const;