remote: update documentation

Add docs for git_clone_local_t and move the docs for the
git_clone_options to each field.

include/git2/clone.h

@@ -23,10 +23,31 @@
  */
 GIT_BEGIN_DECL
 
+/**
+ * Options for bypassing the git-aware transport on clone. Bypassing
+ * it means that instead of a fetch, libgit2 will copy the object
+ * database directory instead of figuring out what it needs, which is
+ * faster. If possible, it will hardlink the files to save space.
+ */
 typedef enum {
+	/**
+	 * Auto-detect (default), libgit2 will bypass the git-aware
+	 * transport for local paths, but use a normal fetch for
+	 * `file://` urls.
+	 */
 	GIT_CLONE_LOCAL_AUTO,
+	/**
+	 * Bypass the git-aware transport even for a `file://` url.
+	 */
 	GIT_CLONE_LOCAL,
+	/**
+	 * Do no bypass the git-aware transport
+	 */
 	GIT_CLONE_NO_LOCAL,
+	/**
+	 * Bypass the git-aware transport, but do not try to use
+	 * hardlinks.
+	 */
 	GIT_CLONE_LOCAL_NO_LINKS,
 } git_clone_local_t;
 
@@ -36,37 +57,58 @@ typedef enum {
  * Use the GIT_CLONE_OPTIONS_INIT to get the default settings, like this:
  *
  *		git_clone_options opts = GIT_CLONE_OPTIONS_INIT;
- *
- * - `checkout_opts` are option passed to the checkout step.  To disable
- *   checkout, set the `checkout_strategy` to GIT_CHECKOUT_NONE.
- *   Generally you will want the use GIT_CHECKOUT_SAFE_CREATE to create
- *   all files in the working directory for the newly cloned repository.
- * - `bare` should be set to zero (false) to create a standard repo,
- *   or non-zero for a bare repo
- * - `ignore_cert_errors` should be set to 1 if errors validating the
- *   remote host's certificate should be ignored.
- *
- *   ** "origin" remote options: **
- *
- * - `remote_name` is the name to be given to the "origin" remote.  The
- *   default is "origin".
- * - `checkout_branch` gives the name of the branch to checkout.  NULL
- *   means use the remote's HEAD.
- * - `signature` is the identity used when updating the reflog. NULL means to
- *   use the default signature using the config.
  */
 
 typedef struct git_clone_options {
 	unsigned int version;
 
+	/**
+	 * These options are passed to the checkout step. To disable
+	 * checkout, set the `checkout_strategy` to
+	 * `GIT_CHECKOUT_NONE`. Generally you will want the use
+	 * GIT_CHECKOUT_SAFE_CREATE to create all files in the working
+	 * directory for the newly cloned repository.
+	 */
 	git_checkout_options checkout_opts;
+
+	/**
+	 * Callbacks to use for reporting fetch progress.
+	 */
 	git_remote_callbacks remote_callbacks;
 
+	/**
+	 * Set to zero (false) to create a standard repo, or non-zero
+	 * for a bare repo
+	 */
 	int bare;
+
+	/**
+	 * Set to 1 if errors validating the remote host's certificate
+	 * should be ignored.
+	 */
 	int ignore_cert_errors;
+
+	/**
+	 * Whether to use a fetch or copy the object database.
+	 */
 	git_clone_local_t local;
+
+	/**
+	 * The name to be given to the remote that will be
+	 * created. The default is "origin".
+	 */
 	const char *remote_name;
+
+	/**
+	 * The name of the branch to checkout. NULL means use the
+	 * remote's default branch.
+	 */
 	const char* checkout_branch;
+
+	/**
+	 * The identity used when updating the reflog. NULL means to
+	 * use the default signature using the config.
+	 */
 	git_signature *signature;
 } git_clone_options;