This is a known bug where a recent change to the Language Reference generation system changed the URL of the "Variable Scope & Qualifiers" section from variable-scope--qualifiers to variable-scope-qualifiers (notice the one less hyphen):
I reported this to the Arduino developers and am waiting to see whether the old URL can be restored. If not, I'll go through the reference and update all the URLs. For now, the workaround is to remove the extra hyphen from the URL when you hit a broken link.
There is a separate issue that was introduced in the recent update which also breaks links, but in a different way:
As we are reporting Reference problems here the page here throw up errors for me if I click on the Serial.setTimeout() and Stream links in the description section near the top of the page.