Learn CodeQL docs: add note about path queries to data flow tutorials #3346
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Fixes https://github.com/github/semmle-docs/issues/48.
Adds a bit of information about path queries (in a reusable note (source)) to the data flow tutorials for the languages where it wasn't already mentioned.
In each case I added the note just below the section about "Global data flow". For example, see Analyzing data flow in C and C++.
(Note the CS changed slightly since it was approved--some work was shifted into https://github.com/github/semmle-docs/issues/68#issuecomment-618432397.)