[clang-tools-extra] [clang-doc] Replace HTML-CHECK commands with HTML-CHECK-NEXT commands (PR #181330)

[Samrudh Nelli via cfe-commits]

SamrudhNelli wrote:

@evelez7 i replaced the HTML-SHAPE, HTML-CALC, etc commands with their corresponding HTML-SHAPE-NEXT, HTML-CALC-NEXT etc commands. 

I omitted the next in some cases where we encountered <p> Defined at line x of file /a/b/y.cpp </p>.
Also used regex to match empty newlines inside <div class="navbar__logo"> containers.

https://github.com/llvm/llvm-project/pull/181330