Pull #13285: Ensure category index page tables are in sync with checks.xml page table

[stoyanK7]

Identified at #13258 (comment)

The tables in index.xml in each category(blocks, naming,etc..) are an exact copy of checks.xml. It turned out that the script doesn't extract them correctly, hence we need this check.

Test run found 3 issues merged. Here is one

The summary for check WhitespaceAfter in the file "src/xdocs/checks/whitespace/index.xml" should match the summary for this check in the file "src/xdocs/checks.xml"
expected: Checks that a token is followed by whitespace, with the exception that it does not check for whitespace after the semicolon of an empty for iterator.
but was : Checks that there is at least one whitespace after the leading asterisk.

[nrmancuso]

Thanks for this.