docs($sce): correct typo

Fix markdown quotation of a `;` so that it is properly rendered in the docs.
Makes it more consistent with the other codeblocked characters in the
list.

Closes angular#12549

Author: lukewaite-intouch

src/ng/sce.js

@@ -542,7 +542,7 @@ function $SceDelegateProvider() {
  *    - There are exactly **two wildcard sequences** - `*` and `**`.  All other characters
  *      match themselves.
  *    - `*`: matches zero or more occurrences of any character other than one of the following 6
- *      characters: '`:`', '`/`', '`.`', '`?`', '`&`' and ';'.  It's a useful wildcard for use
+ *      characters: '`:`', '`/`', '`.`', '`?`', '`&`' and '`;`'.  It's a useful wildcard for use
  *      in a whitelist.
  *    - `**`: matches zero or more occurrences of *any* character.  As such, it's not
  *      appropriate for use in a scheme, domain, etc. as it would match too much.  (e.g.