Fixes misformatting in gettingstarted page.
Fixes misformatting in gettingstarted page.

The underscores in ios_application and ios_test were
being interpreted as an italicize command for the
intervening content.

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MOS_MIGRATED_REVID=124177320

bazelbuild/tulsi,pinterest/tulsi,pinterest/tulsi,bazelbuild/tulsi,pinterest/tulsi,bazelbuild/tulsi,pinterest/tulsi,pinterest/tulsi,bazelbuild/tulsi,bazelbuild/tulsi,pinterest/tulsi,bazelbuild/tulsi