Documentation | c-user: Add chapter for stringto library (!219)

[Prashant Rahul (@prashantrahul141)]

Prashant Rahul created a merge request: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/219

Project:Branches: prashantrahul141/rtems-docs:c-user/stringto to rtems/docs/rtems-docs:main
Author:   Prashant Rahul



## Summary

This adds a new chapter related to stringto library inside classic api
users guide.

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View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/219
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