use sentence case for titles

This makes things consistent
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# Using External Repositories
# Using external repositories
The `rust-lang/rust` git repository depends on several other repos in the `rust-lang` organization.
There are three main ways we use dependencies:
@ -12,7 +12,7 @@ As a general rule:
changes
- Use submodules for tools that are independent of the compiler
## External Dependencies (subtrees)
## External dependencies (subtrees)
The following external projects are managed using some form of a `subtree`:
@ -153,7 +153,7 @@ Now you're done, the `src/tools/clippy` directory behaves as if Clippy were
part of the rustc monorepo, so no one but you (or others that synchronize
subtrees) actually needs to use `git subtree`.
## External Dependencies (submodules)
## External dependencies (submodules)
Building Rust will also use external git repositories tracked using [git submodules].
The complete list may be found in the [`.gitmodules`] file.