docs: Fix various typos in main/

Found via `codespell -q 3 -S "./CREDITS" -L abd,asent,atleast,childrens,contentn,crypted,dne,durationm,exten,inout,leapyear,nd,oclock,offsetp,ot,parm,parms,requestor,ser,slanguage,slin,thirdparty,varn,varns,ues`

(cherry picked from commit d2bcdb71f8)

main/loader.c

@@ -2376,7 +2376,7 @@ static int loader_builtin_init(struct load_order *load_order)
 			continue;
 		}
 
-		/* Parse dependendencies from mod->info. */
+		/* Parse dependencies from mod->info. */
 		if (module_post_register(mod)) {
 			return -1;
 		}