Fix es2019.string.d.ts

trimLeft and trimRight's comments are swapped.

Author: shibukawa

src/lib/es2019.string.d.ts

@@ -5,9 +5,9 @@ interface String {
   /** Removes the leading white space and line terminator characters from a string. */
   trimStart(): string;
 
-  /** Removes the trailing white space and line terminator characters from a string. */
+  /** Removes the leading white space and line terminator characters from a string. */
   trimLeft(): string;
 
-  /** Removes the leading white space and line terminator characters from a string. */
+  /** Removes the trailing white space and line terminator characters from a string. */
   trimRight(): string;
 }