Utilities/tr: Rework squeezing to be supported during more operations

Author: https://github.com/timschumi
Commit: 2e8330f78c
Pull-request: https://github.com/SerenityOS/serenity/pull/10904

Base/usr/share/man/man1/tr.md

@@ -14,7 +14,7 @@ $ tr [--complement] [--delete] [--squeeze-repeats] <from> [to]
 * `--version`: Print version
 * `-c`, `--complement`: Take the complement of the first set
 * `-d`, `--delete`: Delete characters instead of replacing
-* `-s`, `--squeeze-repeats`: Omit repeated characters listed in the 'to' set from the output
+* `-s`, `--squeeze-repeats`: Omit repeated characters listed in the last given set from the output
 
 ## Arguments: