Added doc link to profile header.

[ghemawat]

Output looks something like:

% pprof -top ...
File: ...
Build ID: ...
Type: cpu
Doc: http://example.com/cpuprofile
Duration: 6.71s, Total samples = 5.72s (85.30%)
Showing nodes accounting for 5.17s, 90.38% of 5.72s total
Dropped 326 nodes (cum <= 0.03s)
...

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.34%. Comparing base (0ed6a68) to head (b8fbef6).
Report is 35 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #892      +/-   ##
==========================================
+ Coverage   66.86%   67.34%   +0.48%     
==========================================
  Files          44       44              
  Lines        9824     9825       +1     
==========================================
+ Hits         6569     6617      +48     
+ Misses       2794     2761      -33     
+ Partials      461      447      -14     

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