docs: remove unnecessary =

Co-authored-by: Pooya Parsa Dadashi <pooya_parsa_dadashi@yahoo.com>

Author: kenjis

user_guide_src/source/general/ajax.rst

@@ -54,7 +54,7 @@ React
     axios.get("your url", {headers: {'Content-Type': 'application/json'}})
 
 htmx
-=====
+====
 
 You can use `ajax-header <https://htmx.org/extensions/ajax-header/>`_ extension.