Updating deprecated command example in search.md

[danielartine]

- What I did

- How I did it

- How to verify it

- Description for the changelog
The current example uses --stars flag (deprecated). Changed to --filter=stars to use the right syntax.

- A picture of a cute animal (not mandatory but encouraged)

[GordonTheTurtle]

Please sign your commits following these rules:
https://github.com/moby/moby/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "patch-1" git@github.com:danielartine/cli.git somewhere
$ cd somewhere
$ git commit --amend -s --no-edit
$ git push -f

Amending updates the existing PR. You DO NOT need to open a new one.

[codecov-io]

Codecov Report

Merging #2072 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2072   +/-   ##
=======================================
  Coverage   56.78%   56.78%           
=======================================
  Files         311      311           
  Lines       21836    21836           
=======================================
  Hits        12400    12400           
  Misses       8520     8520           
  Partials      916      916

[thaJeztah]

LGTM, thanks!