TreeUpdateBuilder: Remove confusing note re libgit2 function

It seems obvious from the rest of the docs what to do with a
`TreeUpdateBuilder`.  The reference to `git_tree_create_updated` is
certainloy not helpful since that's a C function.

Signed-off-by: Ian Jackson <[email protected]>

Author: ijackson

src/build.rs

@@ -64,7 +64,7 @@ pub struct RepoBuilder<'cb> {
 pub type RemoteCreate<'cb> =
     dyn for<'a> FnMut(&'a Repository, &str, &str) -> Result<Remote<'a>, Error> + 'cb;
 
-/// A builder struct for git tree updates, for use with `git_tree_create_updated`.
+/// A builder struct for git tree updates.
 pub struct TreeUpdateBuilder {
     updates: Vec<raw::git_tree_update>,
     paths: Vec<CString>,