doc: prevent tables from shrinking page

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This change prevents tables from growing so wide that they shrink the page on mobile.

Problem (currently on https://nodejs.org/api/crypto.html):

Now, on phones, table content will break if it has to, so the page loads the same width as all the other pages. The padding's a tiny bit less, too.

On larger screens, the first column is prevented from wrapping, since it often contains variables. Content in other columns will still wrap (note the URLs wrap, which they don't currently).