Re: [PATCH v2 1/2] docs: fix places that break compilation in MyFirstObjectWalk

Two errors in the example code caused compilation failures due to
a missing semicolon as well as initialization with an empty struct.
This commit fixes that to make the MyFirstObjectWalk tutorial easier to
follow.

Signed-off-by: John Cai <redacted>
---

diff --git a/Documentation/MyFirstObjectWalk.txt b/Documentation/MyFirstObjectWalk.txt

@@ -58,6 +58,7 @@ running, enable trace output by setting the environment variable `GIT_TRACE`.
 Add usage text and `-h` handling, like all subcommands should consistently do
 (our test suite will notice and complain if you fail to do so).
+We'll need to include the `parse-options.h` header.

@@ -65,7 +66,7 @@ int cmd_walken(int argc, const char **argv, const char *prefix)
        const char * const walken_usage[] = {
                N_("git walken"),
                NULL,
-       }
+       };

        struct option options[] = {
                OPT_END()
        };

@@ -195,7 +196,8 @@ Similarly to the default values, we don't have anything to do here yet
 ourselves; however, we should call `git_default_config()` if we aren't calling
 any other existing config callbacks.

-Add a new function to `builtin/walken.c`:
+Add a new function to `builtin/walken.c`.
+We'll also need to include the `config.h` header:

@@ -229,7 +231,9 @@ typically done by calling `repo_init_revisions()` with the repository you intend
 to target, as well as the `prefix` argument of `cmd_walken` and your `rev_info`
 struct.

-Add the `struct rev_info` and the `repo_init_revisions()` call:
+Add the `struct rev_info` and the `repo_init_revisions()` call.
+We'll also need to include the `revision.h` header:

@@ -624,7 +628,8 @@ static void walken_object_walk(struct rev_info *rev)
 Let's start by calling just the unfiltered walk and reporting our counts.
-Complete your implementation of `walken_object_walk()`:
+Complete your implementation of `walken_object_walk()`.
+We'll also need to include the `list-objects.h` header.

@@ -697,7 +702,7 @@ First, we'll need to `#include "list-objects-filter-options.h"` and set up the
 static void walken_object_walk(struct rev_info *rev)
 {
-       struct list_objects_filter_options filter_options = {};
+       struct list_objects_filter_options filter_options = { 0 };