Fix a couple more typos (#619)

Author: ExplodingCabbage

src/diff/word.ts

@@ -25,7 +25,7 @@ const extendedWordChars = 'a-zA-Z0-9_\\u{C0}-\\u{FF}\\u{D8}-\\u{F6}\\u{F8}-\\u{2
 // Each token is one of the following:
 // - A punctuation mark plus the surrounding whitespace
 // - A word plus the surrounding whitespace
-// - Pure whitespace (but only in the special case where this the entire text
+// - Pure whitespace (but only in the special case where the entire text
 //   is just whitespace)
 //
 // We have to include surrounding whitespace in the tokens because the two
@@ -318,7 +318,7 @@ function dedupeWhitespaceInChangeObjects(
 class WordsWithSpaceDiff extends Diff<string, string> {
   tokenize(value: string) {
     // Slightly different to the tokenizeIncludingWhitespace regex used above in
-    // that this one treats each individual newline as a distinct tokens, rather
+    // that this one treats each individual newline as a distinct token, rather
     // than merging them into other surrounding whitespace. This was requested
     // in https://github.com/kpdecker/jsdiff/issues/180 &
     //    https://github.com/kpdecker/jsdiff/issues/211

src/util/string.ts

@@ -104,7 +104,7 @@ export function hasOnlyUnixLineEndings(string: string): boolean {
 
 export function trailingWs(string: string): string {
   // Yes, this looks overcomplicated and dumb - why not replace the whole function with
-  //     return string match(/\s*$/)[0]
+  //     return string.match(/\s*$/)[0]
   // you ask? Because:
   // 1. the trap described at https://markamery.com/blog/quadratic-time-regexes/ would mean doing
   //    this would cause this function to take O(n²) time in the worst case (specifically when