fix(cli): update default min-peers value to 5 to match documentation

[raj921]

Changes

• Updated the default value of the --min-peers flag to 5 in the code to align with the documented default.
• Ensured consistency between the CLI documentation and actual implementation.

Tests

To verify the changes, you can run the integration tests:

go test -tags integration github.com/ChainSafe/gossamer

## Issues

Fixes: #4252

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.52%. Comparing base (d1ca7aa) to head (5b2d7b0).
Report is 181 commits behind head on development.

Additional details and impacted files

@@               Coverage Diff               @@
##           development    #4257      +/-   ##
===============================================
+ Coverage        50.51%   53.52%   +3.01%     
===============================================
  Files              230      297      +67     
  Lines            29006    30634    +1628     
===============================================
+ Hits             14653    16398    +1745     
+ Misses           12856    12348     -508     
- Partials          1497     1888     +391     

[haikoschol]

@raj921 Thanks for the contribution! Don't worry about the failing checks. Please sign the CLA and we'll merge this.

[raj921]

sry for the delay sign in

[jimjbrettj]

Thanks for this!