Use a bit more descriptive name for a parameter

The current parameter name "index" in
CursorAnchorInfo.Builder#setComposingText is a bit hard
to understand.

This CL names it with "composingTextStart" to clarify its usage.

Change-Id: I504939b8d2b48875d8baa9630b5a4f04a5d66dbe
1 file changed