documentation

[ZBX-22165] User macros in web monitoring item names are not supported

Merge in WEB/documentation from feature/ZBX-22165-6.4-D to release/6.4

* commit 'e88b5f9371b7d73ee05e9d099cc943e9e512c8f2':
  [ZBX-22165] Updated: user macro support in Web scenario step names
  [ZBX-22165] Updated wording in pages "Web monitoring", "Web monitoring items"
  [ZBX-22165] Updated wording in "Web monitoring" page
  [ZBX-22165] Updated: user macro support in Web scenario, LLD rule names
  [ZBX-22165] Restored: User macros are supported in Web scenario and LLD rule names
  [ZBX-22165] User macros in [web monitoring] item names no longer supported