Renamed expression with a better name

Co-authored-by: Grégory PLANCHAT <gplanchat@users.noreply.github.com>

Author: sebprt

src/StringExpressionLanguageProvider.php

@@ -21,7 +21,7 @@ public function getFunctions(): array
             ExpressionFunction::fromPhp('number_format', 'formatNumber'),
             ExpressionFunction::fromPhp('strpos', 'indexOf'),
             ExpressionFunction::fromPhp('str_replace', 'replace'),
-            ExpressionFunction::fromPhp('strip_tags', 'clean_up_html'),
+            ExpressionFunction::fromPhp('strip_tags', 'stripHtml'),
             ExpressionFunction::fromPhp('json_decode', 'decode'),
             new FileName('fileName'),
             new DateTime('dateTime'),