_content: add styles for mod table

[0x1306e6d]

Make Environment variables table readable: align table cell to top and add
border between rows.

Fixes golang/go#67368

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Patch Set 1:

(1 comment)

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[jjlin]

@0x1306e6d I wasn't able to add this comment on Gerrit for some reason:

While I opened the bug for the environment variables table in particular, every table in the same page is affected (there are quite a few if you search for <table), so it would be good to fix those too.

I'm not sure if other pages in the Go docs are similarly affected. I sampled a few other prominent doc pages, but based on those, it doesn't seem like tables are used often in general.

[0x1306e6d]

Hi @jjlin I've updated all tables in the mod page. PTAL.

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This PR (HEAD: 7646862) has been imported to Gerrit for code review.

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