[fix] make docs -> ERROR: Unknown target name: "google: max 50 pages".

Fix the issues reported by sphinx build::

    docstring of searx.engines.google.max_page:1: ERROR: Unknown target name: "google: max 50 pages".
    docstring of searx.engines.google_images.max_page:1: ERROR: Unknown target name: "google: max 50 pages".
    docstring of searx.engines.google_scholar.max_page:1: ERROR: Unknown target name: "google: max 50 pages".

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/engines/google.py

@@ -53,9 +53,9 @@ about = {
 categories = ['general', 'web']
 paging = True
 max_page = 50
-"""`Google: max 50 pages`_
+"""`Google max 50 pages`_
 
-.. _Google: max 50 pages: https://github.com/searxng/searxng/issues/2982
+.. _Google max 50 pages: https://github.com/searxng/searxng/issues/2982
 """
 time_range_support = True
 safesearch = True

searx/engines/google_images.py

@@ -47,9 +47,9 @@ about = {
 categories = ['images', 'web']
 paging = True
 max_page = 50
-"""`Google: max 50 pages`_
+"""`Google max 50 pages`_
 
-.. _Google: max 50 pages: https://github.com/searxng/searxng/issues/2982
+.. _Google max 50 pages: https://github.com/searxng/searxng/issues/2982
 """
 
 time_range_support = True

searx/engines/google_scholar.py

@@ -51,9 +51,9 @@ about = {
 categories = ['science', 'scientific publications']
 paging = True
 max_page = 50
-"""`Google: max 50 pages`_
+"""`Google max 50 pages`_
 
-.. _Google: max 50 pages: https://github.com/searxng/searxng/issues/2982
+.. _Google max 50 pages: https://github.com/searxng/searxng/issues/2982
 """
 language_support = True
 time_range_support = True