Add doc URL to profile format and use it display help link.

[ghemawat]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.33%. Comparing base (0ed6a68) to head (5b49d6c).
Report is 34 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #888      +/-   ##
==========================================
+ Coverage   66.86%   67.33%   +0.47%     
==========================================
  Files          44       44              
  Lines        9824     9822       -2     
==========================================
+ Hits         6569     6614      +45     
+ Misses       2794     2761      -33     
+ Partials      461      447      -14     

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[ghemawat]

This is now ready to review. Changes from prior commit:

1. Rebased to pick up Go version changes.
2. Added a small test to cover new code.

[ghemawat]

Will need another approval because of the comment change, sorry.

[aalexand]

@ghemawat We didn't add printing the link in the pprof CLI output, right? Should we add that too? E.g. the -top output has some summary information at the beginning, perhaps we should show the link there?

[ghemawat]

@ghemawat We didn't add printing the link in the pprof CLI output, right? Should we add that too? E.g. the -top output has some summary information at the beginning, perhaps we should show the link there?

Good point. I can do that in a bit. It is less useful since it doesn't show up as a clickable link, but might as well add it.