docs: add a pointer receiver example

[shubham-cmyk]

Fix : #116

Added one example in the doc

PR sponsored by Obmondo.com

[tmzane]

@shubham-cmyk could you allow pushing to your branch for maintainers? https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/allowing-changes-to-a-pull-request-branch-created-from-a-fork

[shubham-cmyk]

Since this is a company paid contribution, company rules are that we fork to company account repo on github. Github unfortunately does not support this allow maintainer to edit in repo for organization accounts.
So the options as I see them are:

1. you tell me what you want me to change - before you'll merge
2. you pull my branch to a branch in your repo, edit, create your own PR from that and merge that with my commits in it too

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.87%. Comparing base (30a5cdc) to head (584a7af).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #117      +/-   ##
==========================================
- Coverage   79.26%   73.87%   -5.39%     
==========================================
  Files           3        3              
  Lines         217      222       +5     
==========================================
- Hits          172      164       -8     
- Misses         32       47      +15     
+ Partials       13       11       -2     

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