[linux-stable-rc:linux-5.4.y 4226/5188] htmldocs: Warning: Documentation/admin-guide/sysctl/kernel.rst references a file that doesn't exist: Documentation/filesystems/devpts.rst

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.4.y
head:   1cece69eaa889a27cf3e9f2051fcc57eda957271
commit: 42a9a7e807505b485f7c6a7ffb0ffb7dab8e1b51 [4226/5188] random: always wake up entropy writers after extraction
reproduce:
        # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git/commit/?id=42a9a7e807505b485f7c6a7ffb0ffb7dab8e1b51
        git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
        git fetch --no-tags linux-stable-rc linux-5.4.y
        git checkout 42a9a7e807505b485f7c6a7ffb0ffb7dab8e1b51
        make menuconfig
        # enable CONFIG_COMPILE_TEST, CONFIG_WARN_MISSING_DOCUMENTS, CONFIG_WARN_ABI_ERRORS
        make htmldocs

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

>> Warning: Documentation/admin-guide/sysctl/kernel.rst references a file that doesn't exist: Documentation/filesystems/devpts.rst

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