docs(TSP-1335): document evaluation version picker and MCP tool - #716

Running Vale across on the following files affected by this PR:

- build/agents/build-your-agent/evals.mdx
- integrations/mcp/programmatic-gtm/mcp-server.mdx

Attempting to initialize Vale linter...
No customer vale configuration detected. Using Mintlify's default configuration.
Attempting to run Vale spellcheck...
Vale spellcheck completed successfully.

build/agents/build-your-agent/evals.mdx:
	- 3:16      Did you really mean 'Evals'?
	- 8:21      Did you really mean 'Evals'?
	- 11:5      Did you really mean 'Evals'?
	- 11:178    Did you really mean 'Evals'?
	- 11:323    Did you really mean 'Evals'?
	- 13:28     Did you really mean 'Evals'?
	- 15:25     Did you really mean 'Evals'?
	- 31:4      Did you really mean 'Evals'?
	- 33:5      Did you really mean 'Evals'?

integrations/mcp/programmatic-gtm/mcp-server.mdx:
	- 42:98    Did you really mean 'Edu'?


Found 10 suggested changes across 2 files in 795.54ms