docs: use --prerelease=explicit for install instructions - #2971

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

- getting-started/installation.mdx
- servers/tasks.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.

docs/getting-started/installation.mdx:
	- 75:210    Did you really mean 'fastmcp'?

docs/servers/tasks.mdx:
	- 37:53     Did you really mean 'asyncio'?
	- 176:43    Did you really mean 'Valkey'?

docs/v2/getting-started/installation.mdx:
	- 65:210    Did you really mean 'fastmcp'?

docs/v2/servers/tasks.mdx:
	- 33:53     Did you really mean 'asyncio'?
	- 140:43    Did you really mean 'Valkey'?


Found 6 suggested changes across 4 files in 10034.36ms