Removed reference to MSP docs project as it created a circular reference

[daijoubu]

User description

Removed the reference to https://github.com/xznhj8129/msp_documentation as it was pointing back to the MSP_REF.md document in iNavFlight/inav and reran the gen_docs.sh script.
Renamed MSP_REF.md to README.md so it will show as the readme for that directory.

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PR Type

Bug fix

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Description

• Removed circular reference to external MSP documentation project

• Fixed FEATURE_FW_AUTOTRIM enum value to use unsigned literal (1U << 31)

• Corrected systemState_e source file reference from fc_init.h to fc_init.c

• Fixed formatting issue in JSON file revision marker

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Diagram Walkthrough

flowchart LR
  A["MSP Documentation Header"] -->|Remove circular ref| B["External docs link removed"]
  C["Enum Definitions"] -->|Fix unsigned literal| D["FEATURE_FW_AUTOTRIM corrected"]
  E["Source References"] -->|Correct file path| F["systemState_e source updated"]

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File Walkthrough

	Relevant files
Bug fix	docs_v2_header.md Remove external MSP docs circular reference                            docs/development/msp/docs_v2_header.md Removed reference to external msp_documentation project that created circular dependency Cleaned up documentation header to point only to official resources +0/-1      inav_enums.json Fix enum values and source references                                        docs/development/msp/inav_enums.json Changed FEATURE_FW_AUTOTRIM value from "1 << 31" to "1U << 31" to use unsigned literal Corrected systemState_e source file reference from fc_init.h to fc_init.c +2/-2      msp_ref.md Remove external docs link and fix formatting                          docs/development/msp/msp_ref.md Removed reference to external msp_documentation project link Fixed formatting of JSON file revision marker +2/-2
Documentation	inav_enums_ref.md Update enum documentation and source paths                              docs/development/msp/inav_enums_ref.md Updated FEATURE_FW_AUTOTRIM documentation to reflect unsigned literal (1U << 31) Corrected systemState_e source file path from fc_init.c to fc_init.h and vice versa for consistency +3/-3

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[qodo-code-review]

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