git-var doc: fix usage of $ENV_VAR vs ENV_VAR

When refering to environment variables in the documentation, use the
ENV_VARIABLE format instead of $ENV_VARIABLE. The latter is used in the
documentation to refer to the actual value of the variable, not the name
of the variable.

Signed-off-by: Jean-Noël Avila <jn.avila@free.fr>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/git-var.adoc

@@ -32,58 +32,56 @@ EXAMPLES
 
 VARIABLES
 ---------
-GIT_AUTHOR_IDENT::
+`GIT_AUTHOR_IDENT`::
     The author of a piece of code.
 
-GIT_COMMITTER_IDENT::
+`GIT_COMMITTER_IDENT`::
     The person who put a piece of code into Git.
 
-GIT_EDITOR::
+`GIT_EDITOR`::
     Text editor for use by Git commands.  The value is meant to be
     interpreted by the shell when it is used.  Examples: `~/bin/vi`,
     `$SOME_ENVIRONMENT_VARIABLE`, `"C:\Program Files\Vim\gvim.exe"
-    --nofork`.  The order of preference is the `$GIT_EDITOR`
+    --nofork`.  The order of preference is `$GIT_EDITOR`, then
-    environment variable, then `core.editor` configuration, then
+    `core.editor` configuration value, then `$VISUAL`, then
-    `$VISUAL`, then `$EDITOR`, and then the default chosen at compile
+    `$EDITOR`, and then the default chosen at compile
     time, which is usually 'vi'.
 ifdef::git-default-editor[]
     The build you are using chose '{git-default-editor}' as the default.
 endif::git-default-editor[]
 
-GIT_SEQUENCE_EDITOR::
+`GIT_SEQUENCE_EDITOR`::
     Text editor used to edit the 'todo' file while running `git rebase
     -i`. Like `GIT_EDITOR`, the value is meant to be interpreted by
-    the shell when it is used. The order of preference is the
+    the shell when it is used. The order of preference is
-    `$GIT_SEQUENCE_EDITOR` environment variable, then
+    `$GIT_SEQUENCE_EDITOR`, then `sequence.editor` configuration value,
-    `sequence.editor` configuration, and then the value of `git var
+    and then the value of `git var GIT_EDITOR`.
-    GIT_EDITOR`.
 
-GIT_PAGER::
+`GIT_PAGER`::
     Text viewer for use by Git commands (e.g., 'less').  The value
     is meant to be interpreted by the shell.  The order of preference
-    is the `$GIT_PAGER` environment variable, then `core.pager`
+    is `$GIT_PAGER`, then the value of `core.pager` configuration, then
-    configuration, then `$PAGER`, and then the default chosen at
+    `$PAGER`, and then the default chosen at compile time (usually `less`).
-    compile time (usually 'less').
 ifdef::git-default-pager[]
     The build you are using chose '{git-default-pager}' as the default.
 endif::git-default-pager[]
 
-GIT_DEFAULT_BRANCH::
+`GIT_DEFAULT_BRANCH`::
     The name of the first branch created in newly initialized repositories.
 
-GIT_SHELL_PATH::
+`GIT_SHELL_PATH`::
     The path of the binary providing the POSIX shell for commands which use the shell.
 
-GIT_ATTR_SYSTEM::
+`GIT_ATTR_SYSTEM`::
     The path to the system linkgit:gitattributes[5] file, if one is enabled.
 
-GIT_ATTR_GLOBAL::
+`GIT_ATTR_GLOBAL`::
     The path to the global (per-user) linkgit:gitattributes[5] file.
 
-GIT_CONFIG_SYSTEM::
+`GIT_CONFIG_SYSTEM`::
     The path to the system configuration file, if one is enabled.
 
-GIT_CONFIG_GLOBAL::
+`GIT_CONFIG_GLOBAL`::
     The path to the global (per-user) configuration files, if any.
 
 Most path values contain only one value. However, some can contain multiple