[sensor] Clarify sequence requirement between setEventRate and enable

Clarify sequence requirement between setEventRate and enable.
Also improved the format of doc.

Bug: 31517908
Test: compiles
Change-Id: I31865d0aea579cee3942df43cd22e1622d724d7c
Merged-In: I31865d0aea579cee3942df43cd22e1622d724d7c
1 file changed