Audit and fix remaining deprecated session terminology in documentation

## Problem
There may be remaining references to deprecated session terminology throughout the documentation that need to be updated.

## Files to Audit
- All documentation files in docs/ directory
- Look for 'sesion' typos, deprecated session functions, and outdated terminology

## Changes Needed
- Replace deprecated session references with current trace terminology
- Fix any spelling errors ('sesion' -> 'session' -> 'trace')
- Update function references (start_session/end_session -> start_trace/end_trace)
- Ensure consistent terminology throughout

## Context
Comprehensive audit needed to catch any remaining deprecated terminology that wasn't caught in initial fixes.

## Assignee
Please assign to Dwij when creating