Documentation | docs: clarify relationship between RTEMS, Newlib, and GCC cross-compilers (!213)

[Devagya Rattan (@Devagya18)]

Devagya Rattan created a merge request: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/213

Project:Branches: Devagya18/rtems-docs:main to rtems/docs/rtems-docs:main
Author:   Devagya Rattan




## Summary

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* Clarified the distinct roles of RTEMS, Newlib, and the GCC cross-compiler within the RTEMS toolchain.
* Explained that RTEMS provides the real-time operating system and APIs, while Newlib supplies the C standard library used by RTEMS.
* Described the GCC cross-compiler as the toolchain used to build RTEMS itself, BSPs, and RTEMS applications for target architectures.
* Removed ambiguity for new users about whether Newlib or GCC are part of RTEMS or external dependencies.
* Improved overall readability of the documentation for beginners and first-time contributors.

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View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/213
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