pipx examples and tests: fix terminology (#10649)

Fix terminology.

Author: felixfontein

plugins/modules/pipx.py

@@ -175,7 +175,7 @@
     name: tox
     state: upgrade
 
-- name: Install or upgrade tox with dependency group 'docs'
+- name: Install or upgrade tox with extra 'docs'
   community.general.pipx:
     name: tox
     source: tox[docs]

tests/integration/targets/pipx/tasks/main.yml

@@ -217,14 +217,14 @@
     name: tox
   register: uninstall_tox_2
 
-- name: install tox with dependency group 'docs'
+- name: install tox with extra 'docs'
   community.general.pipx:
     name: tox
     source: tox[docs]
     state: latest
   register: install_tox_latest_docs
 
-- name: install tox with dependency group 'docs' again
+- name: install tox with extra 'docs' again
   community.general.pipx:
     name: tox
     source: tox[docs]