Merge pull request #1 from progit/correction-corrections

Small fixes

Author: carlosmn

book/B-embedding-git/sections/libgit2.asc

@@ -127,7 +127,7 @@ int error = git_odb_new(&odb); // <1>
 git_odb_backend *my_backend;
 error = git_odb_backend_mine(&my_backend, /*…*/); // <2>
 
-error = git_odb_add_backendodb, my_backend, 1); // <3>
+error = git_odb_add_backend(odb, my_backend, 1); // <3>
 
 git_repository *repo;
 error = git_repository_open(&repo, "some-path");
@@ -138,8 +138,8 @@ _(Note that errors are captured, but not handled. We hope your code is better th
 
 <1> Initialize an empty object database (ODB) ``frontend,'' which will act as a container for the ``backends'' which are the ones doing the real work.
 <2> Initialize a custom ODB backend.
-<3> Open a repository
-<4> Set the repository to use our ODB to look up objects.
+<3> Add the backend to the frontend.
+<4> Open a repository, and set it to use our ODB to look up objects.
 
 But what is this `git_odb_backend_mine` thing?
 Well, that's the constructor for your own ODB implementation, and you can do whatever you want in there, so long as you fill in the `git_odb_backend` structure properly.