Fix formatting.

These words are meant to be in the code _font_, not in their own
separate code _blocks_. See
https://developer.android.com/ndk/reference/group/thermal#athermal_getthermalheadroom
for the current wrong formatting.

Bug: https://github.com/android/ndk/issues/1933
Test: treehugger
Change-Id: I2a30439bd58dd1435c4efb525a90e06631fbe6cf