Link to string length is incorrect
This issue is about document of string command https://cmake.org/cmake/help/git-master/command/string.html
The link is https://cmake.org/cmake/help/git-master/command/string.html#json-length but it should be https://cmake.org/cmake/help/git-master/command/string.html#length
I tried to fix it but with no luck.
If removing the following code, it works fine.
string(JSON <out-var> [ERROR_VARIABLE <error-var>]
{`GET <JSON GET_>`_ | `TYPE <JSON TYPE_>`_ | `LENGTH <JSON LENGTH_>`_ | `REMOVE <JSON REMOVE_>`_}
<json-string> <member|index> [<member|index> ...])
A minimal reproduce may be
This is a paragraph that contains `a link`_.
This is a paragraph that contains `a link <b link_>`_.
.. _a link: https://example.com/
.. _b link: https://cmake.org/