OsTest: Manually fix up formatting.

The parent CL reformatted OsTest.java using IntelliJ's automated reformatter
(Code / Reformat Code). It messed up in a handful of places, creating lines
that were too long (in line comments) or too short (in block comments). This
CL manually corrects these minor mistakes.

Test: Treehugger
Change-Id: I14fd7a3d58fffdb60e88b3dca7c7fe47ad1481a4