Update misspell to 0.5.1 and add misspellings.csv (#30573)

Misspell 0.5.0 supports passing a csv file to extend the list of
misspellings, so I added some common ones from the codebase. There is at
least one typo in a API response so we need to decided whether to revert
that and then likely remove the dict entry.

modules/git/ref.go

@@ -184,7 +184,7 @@ func (ref RefName) RefGroup() string {
 }
 
 // RefType returns the simple ref type of the reference, e.g. branch, tag
-// It's differrent from RefGroup, which is using the name of the directory under .git/refs
+// It's different from RefGroup, which is using the name of the directory under .git/refs
 // Here we using branch but not heads, using tag but not tags
 func (ref RefName) RefType() string {
 	var refType string