Update localizeFormat.md

Author: DeveloperTryingToCodeLikeOtherOfThem

docs/developers/core/localizeFormat.md

@@ -7,7 +7,7 @@ translation system can extract it and translate into other languages.
 The implementation behaves like this under the hood.
 ``` ts
     function lf(s: string, ...args: any[]): string { // @ignorelf@
-        let lfmt = _localizeStrings[s] || s;
+        let lfmt = _localizeStrings[s] || s; // either be _localizedStrings with the index being the string input, or simply the string input itself.
 
         if (!sForPlural && lfmt != s && /\d:s\}/.test(lfmt)) {
             lfmt = lfmt.replace(/\{\d+:s\}/g, "")