config.txt: move ssh.* to a separate file

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/config.txt

@@ -621,42 +621,6 @@ Environment variable settings always override any matches.  The URLs that are
 matched against are those given directly to Git commands.  This means any URLs
 visited as a result of a redirection do not participate in matching.
 
-ssh.variant::
-	By default, Git determines the command line arguments to use
-	based on the basename of the configured SSH command (configured
-	using the environment variable `GIT_SSH` or `GIT_SSH_COMMAND` or
-	the config setting `core.sshCommand`). If the basename is
-	unrecognized, Git will attempt to detect support of OpenSSH
-	options by first invoking the configured SSH command with the
-	`-G` (print configuration) option and will subsequently use
-	OpenSSH options (if that is successful) or no options besides
-	the host and remote command (if it fails).
-+
-The config variable `ssh.variant` can be set to override this detection.
-Valid values are `ssh` (to use OpenSSH options), `plink`, `putty`,
-`tortoiseplink`, `simple` (no options except the host and remote command).
-The default auto-detection can be explicitly requested using the value
-`auto`.  Any other value is treated as `ssh`.  This setting can also be
-overridden via the environment variable `GIT_SSH_VARIANT`.
-+
-The current command-line parameters used for each variant are as
-follows:
-+
---
-
-* `ssh` - [-p port] [-4] [-6] [-o option] [username@]host command
-
-* `simple` - [username@]host command
-
-* `plink` or `putty` - [-P port] [-4] [-6] [username@]host command
-
-* `tortoiseplink` - [-P port] [-4] [-6] -batch [username@]host command
-
---
-+
-Except for the `simple` variant, command-line parameters are likely to
-change as git gains new features.
-
 i18n.commitEncoding::
 	Character encoding the commit messages are stored in; Git itself
 	does not care per se, but this information is necessary e.g. when
@@ -1298,6 +1262,8 @@ splitIndex.sharedIndexExpire::
 	either created based on it or read from it.
 	See linkgit:git-update-index[1].
 
+include::config/ssh.txt[]
+
 status.relativePaths::
 	By default, linkgit:git-status[1] shows paths relative to the
 	current directory. Setting this variable to `false` shows paths

Documentation/config/ssh.txt

@@ -0,0 +1,35 @@
+ssh.variant::
+	By default, Git determines the command line arguments to use
+	based on the basename of the configured SSH command (configured
+	using the environment variable `GIT_SSH` or `GIT_SSH_COMMAND` or
+	the config setting `core.sshCommand`). If the basename is
+	unrecognized, Git will attempt to detect support of OpenSSH
+	options by first invoking the configured SSH command with the
+	`-G` (print configuration) option and will subsequently use
+	OpenSSH options (if that is successful) or no options besides
+	the host and remote command (if it fails).
++
+The config variable `ssh.variant` can be set to override this detection.
+Valid values are `ssh` (to use OpenSSH options), `plink`, `putty`,
+`tortoiseplink`, `simple` (no options except the host and remote command).
+The default auto-detection can be explicitly requested using the value
+`auto`.  Any other value is treated as `ssh`.  This setting can also be
+overridden via the environment variable `GIT_SSH_VARIANT`.
++
+The current command-line parameters used for each variant are as
+follows:
++
+--
+
+* `ssh` - [-p port] [-4] [-6] [-o option] [username@]host command
+
+* `simple` - [username@]host command
+
+* `plink` or `putty` - [-P port] [-4] [-6] [username@]host command
+
+* `tortoiseplink` - [-P port] [-4] [-6] -batch [username@]host command
+
+--
++
+Except for the `simple` variant, command-line parameters are likely to
+change as git gains new features.