Fix typo in comment

possibe -> possible

Author: Ikko Ashimine

Matcher/Dumper/CompiledUrlMatcherDumper.php

@@ -242,7 +242,7 @@ private function compileStaticRoutes(array $staticRoutes, array &$conditions): a
      * Paths that can match two or more routes, or have user-specified conditions are put in separate switch's cases.
      *
      * Last but not least:
-     *  - Because it is not possibe to mix unicode/non-unicode patterns in a single regexp, several of them can be generated.
+     *  - Because it is not possible to mix unicode/non-unicode patterns in a single regexp, several of them can be generated.
      *  - The same regexp can be used several times when the logic in the switch rejects the match. When this happens, the
      *    matching-but-failing subpattern is excluded by replacing its name by "(*F)", which forces a failure-to-match.
      *    To ease this backlisting operation, the name of subpatterns is also the string offset where the replacement should occur.