Fix formatting in table headers for better accessibility

[hichemfantar]

Eliminate unnecessary italics for better readability because italics in general negatively affect legibility

you can see how the first header looks much more readable compared to the other two. testing this and then we can apply the fix to the rest of the documentation.

related to elixir-lang/ex_doc#2039

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CT Test Results

   10 files    304 suites   3h 57m 0s ⏱️
4 177 tests 3 849 ✅ 326 💤 2 ❌
5 485 runs  5 080 ✅ 403 💤 2 ❌

For more details on these failures, see this check.

Results for commit c3679fc.

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// Erlang/OTP Github Action Bot

[garazdawi]

Agreed, thanks for fixing. When I did a git grep "^| _" I found 40 other tables using the same convention. Would you mind fixing those as well so that we get consistence across the code base?

[hichemfantar]

used this regex to find all instances \|\s*_([^_]+)_\s*\| and did a couple of runs for it to replace everything
replaced with | $1 | and formatted everything

i checked for mistakes and everything looks good but you should probably take a look too

[garazdawi]

I looked through it and everything looks good. Thanks!