cmd: update target arg desc in several commands

adding tracked files/dirs and removing -R
rel iterative/dvc#4191

content/docs/command-reference/checkout.md

@@ -10,9 +10,8 @@ usage: dvc checkout [-h] [-q | -v] [--summary] [-d] [-R] [-f]
                     [--relink] [targets [targets ...]]
 
 positional arguments:
-  targets        Limit command scope to these stages or .dvc files.
-                 Using -R, directories to search for stages or .dvc
-                 files can also be given.
+  targets       Limit command scope to these tracked files/directories,
+                .dvc files, or stage names.
 ```
 
 ## Description

content/docs/command-reference/fetch.md

@@ -11,9 +11,8 @@ usage: dvc fetch [-h] [-q | -v] [-j <number>] [-r <name>] [-a] [-T]
                  [targets [targets ...]]
 
 positional arguments:
-  targets        Limit command scope to these stages or .dvc files.
-                 Using -R, directories to search for stages or .dvc
-                 files can also be given.
+  targets       Limit command scope to these tracked files/directories,
+                .dvc files, or stage names.
 ```
 
 ## Description

content/docs/command-reference/pull.md

@@ -15,8 +15,7 @@ usage: dvc pull [-h] [-q | -v] [-j <number>] [-r <name>] [-a] [-T]
 
 positional arguments:
   targets       Limit command scope to these tracked files/directories,
-                .dvc files, or stage names. Using -R, directories to
-                search for .dvc files or stages can also be given.
+                .dvc files, or stage names.
 ```
 
 ## Description

content/docs/command-reference/push.md

@@ -12,8 +12,7 @@ usage: dvc push [-h] [-q | -v] [-j <number>] [-r <name>] [-a] [-T]
 
 positional arguments:
   targets       Limit command scope to these tracked files/directories,
-                .dvc files, or stage names. Using -R, directories to
-                search for .dvc files or stages can also be given.
+                .dvc files, or stage names.
 ```
 
 ## Description

content/docs/command-reference/status.md

@@ -13,9 +13,8 @@ usage: dvc status [-h] [-v] [-j <number>] [-q] [-c] [-r <name>] [-a] [-T]
                   [targets [targets ...]]
 
 positional arguments:
-  targets       Limit command scope to these .dvc files, stage names,
-                or tracked files/directories. Using -R, directories to
-                search for .dvc files or stages can also be given.
+  targets       Limit command scope to these tracked files/directories,
+                .dvc files, or stage names.
 ```
 
 ## Description