test-documentation: Clean up fixed HTML validation ignore patterns.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

tools/documentation.vnufilter

@@ -1,8 +1,3 @@
-# Real errors that should be fixed.
-
-# https://github.com/readthedocs/sphinx_rtd_theme/pull/961
-Attribute “alt” not allowed on element “a” at this point\.
-
 # Warnings that are probably less important.
 
 The “type” attribute is unnecessary for JavaScript resources\.

tools/documentation_crawler/documentation_crawler/spiders/common/spiders.py

@@ -49,8 +49,6 @@ VNU_IGNORE = [
     r"No “p” element in scope but a “p” end tag seen\.",
     r"Element “div” not allowed as child of element “ul” in this context\. "
     + r"\(Suppressing further errors from this subtree\.\)",
-    # Warnings that are probably less important.
-    r"The “type” attribute is unnecessary for JavaScript resources\.",
 ]
 VNU_IGNORE_REGEX = re.compile(r"|".join(VNU_IGNORE))