docs: Update "Using Apollo with TypeScript" with a description of fetchMore and subscribeToMore (#10066)
docs: Update "Using Apollo with TypeScript" with a description of fetchMore and subscribeToMore (#10066)

* fix: use tsx instead of jsx in fenced code blocks

Ensures syntax highlighting is accurately annotated

* feat: subscribeToMore / fetchMore type docs

Add brief explanation and examples for the type parameters of
subscribeToMore and fetchMore
apollographql/apollo-client,apollographql/apollo-client