Expand RRC developer and usage documentation to match the current
multi-cell design with separate DU and cell management.
- rrc-dev.md: Document DU and cell data structures and key functions
(get_du_by_assoc_id, get_cell_by_cell_id, rrc_add_cell_to_du, etc.);
add DU and cell lifecycle (F1 Setup, config update, disconnection)
and UE cell association (serving cells, PCell/SCells) with sequence
diagrams; add handover and cell association update flow; update UE
context description.
- rrc-usage.md: Update DU/cell list output format and description
(e.g. integrated DU-CU) and multi-cell per DU wording.
- Remove multiple single top-level (# H1) headings per file
- Use (# H2 and ###### H6) sub-headings for consistency
- Remove any trailing # in the headings
- This ensures proper table of contents rendering in MkDocs.
- Also removed RUN_NR_multiple_BWPs.md as it is moved to MAC usage
- Give a line in between bullet points to reflect bullet points correctly
- Split long statement into bullet points for readability
- Format the document for proper rendering
- Fix table formatting
- Use standard TOC syntax in 5GNAS
Guido Casati