sys/include/tsrb.h: move usage doc to main API page. Modified file doc header so that important info about usage and buffer size show up on main API doc page instead of file doc page; added comment in a couple of places to remind reader that buffer size must be powewr of 2.
sys/include/tsrb.h: move usage doc to main API page.
Modified file doc header so that important info about usage and buffer
size show up on main API doc page instead of file doc page;
added comment in a couple of places to remind reader that buffer size
must be powewr of 2.

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