docs(ffi): cover cc, viewSource, Node-API types, and fix CFunction usage - #31535

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

- runtime/c-compiler.mdx
- runtime/ffi.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/runtime/c-compiler.mdx:
	- 58:3      Did you really mean 'cstring'?
	- 76:3      Did you really mean 'napi_env'?
	- 77:3      Did you really mean 'napi_value'?
	- 188:64    Did you really mean 'preprocessor'?
	- 192:35    Did you really mean 'preprocessor'?

docs/runtime/ffi.mdx:
	- 15:4       Did you really mean 'dlopen'?
	- 36:24      Did you really mean 'cstring'?
	- 72:72      Did you really mean 'dlopen'?
	- 186:3      Did you really mean 'napi_env'?
	- 187:3      Did you really mean 'napi_value'?
	- 199:53     Did you really mean 'interoperate'?
	- 275:114    Did you really mean 'napi'?
	- 500:3      Did you really mean 'intptr'?


Found 13 suggested changes across 2 files in 630.55ms