Revise RELATIVE_X and RELATIVE_Y motion ranges documentation.

Revise documentation for motion ranges of RELATIVE_X and RELATIVE_Y axes.

Bug: 117859192
Test: atest inputflinger_tes
Change-Id: I3a02400eb648fd4d5dc96a21c5d929e4f9a2428a
Merged-In: I3a02400eb648fd4d5dc96a21c5d929e4f9a2428a
1 file changed