chore: fix some typos in comments (#3108)

Signed-off-by: loselarry <bikangning@yeah.net>

frontend/src/utils/clipboard.ts

@@ -22,7 +22,7 @@ export function copy(text: string) {
           }
         })
         .catch((e) => {
-          // Firefox doesnt support clipboard-write permission
+          // Firefox doesn't support clipboard-write permission
           if (navigator.userAgent.indexOf("Firefox") != -1) {
             navigator.clipboard.writeText(text).then(resolve).catch(reject);
           } else {

frontend/src/utils/upload.ts

@@ -35,7 +35,7 @@ export function scanFiles(dt: DataTransfer): Promise<UploadList | FileList> {
     const contents: UploadList = [];
 
     if (dt.items) {
-      // ts didnt like the for of loop even tho
+      // ts didn't like the for of loop even tho
       // it is the official example on MDN
       // for (const item of dt.items) {
       for (let i = 0; i < dt.items.length; i++) {