Fix various documentation, user-facing, and source comment typos (#16367)

* Fix various doc, user-facing, and source comment typos

Found via `codespell -q 3 -S ./options/locale,./vendor -L ba,pullrequest,pullrequests,readby`

modules/markup/html.go

@@ -274,7 +274,7 @@ func RenderDescriptionHTML(
 }
 
 // RenderEmoji for when we want to just process emoji and shortcodes
-// in various places it isn't already run through the normal markdown procesor
+// in various places it isn't already run through the normal markdown processor
 func RenderEmoji(
 	content string,
 ) (string, error) {