htmldocs: Documentation/leds/leds-qcom-lpg.rst: WARNING: document isn't included in any toctree

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   88084a3df1672e131ddc1b4e39eeacfd39864acf
commit: 24e2d05d1b68981f22c984c766fabc5a93c83dba leds: Add driver for Qualcomm LPG
date:   9 weeks ago
reproduce: 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 >>):

>> Documentation/leds/leds-qcom-lpg.rst: WARNING: document isn't included in any toctree

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