Because Lightroom CC2015 and Lightroom 6 are the same software program. The difference is Lightroom 6 is missing Dehaze and several other tools (they have been disabled) that have been added to CC since Lightroom 6/CC was released.
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LR6 is the standalone version and LR CC is the subscription version.
They are basically the same program, and the main difference is the way they are licensed.
But CC is updated with new features - that will not be implemented in the standalone version until a new major version - LR7 - is released.
There aren't a lot of new features in CC currently, but the Dehaze filter comes to mind.
You should be fine using the help files for CC.