doc: fixed a few typos in godoc comments

[fredbi]

doc site: fixed clickable link to go playground for testable examples.

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.52%. Comparing base (82de69b) to head (92eaeb1).
⚠️ Report is 2 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #59      +/-   ##
==========================================
+ Coverage   95.50%   95.52%   +0.01%     
==========================================
  Files          83       83              
  Lines       10888    10888              
==========================================
+ Hits        10399    10401       +2     
+ Misses        319      318       -1     
+ Partials      170      169       -1     

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