Fix a typo in windows.md
Fix a typo in windows.md

Also add syntax highlighting to the bash commands.

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Change-Id: I327593afdfb048e4a348738ea2c9902ab48f0431
Reviewed-on: https://bazel-review.googlesource.com/#/c/2980/
MOS_MIGRATED_REVID=115104422

bazelbuild/bazel-website,bazelbuild/bazel-website,davidzchen/bazel-website,davidzchen/bazel-website,davidzchen/bazel-website,davidzchen/bazel-website,bazelbuild/bazel-website