modify some bugs

doc/design/file_mananger/pfs/cp.md

@@ -8,11 +8,11 @@ cp - copy files and directories
 # Description
 
 ```		
-	--preserve--links
-       Reserve links when copy files
-       
-    -R, -r, --recursive
-       Copy directories recursively
+--preserve--links
+   Reserve links when copy links
+   
+-R, -r, --recursive
+   Copy directories recursively
 ```
 
 # Examples

doc/design/file_mananger/pfs/ls.md

@@ -7,11 +7,11 @@ ls - list directory contents or a file attributes
 # Description
 
 ```       
-    -R, -r, --recursive
-       Copy directories recursively
-       
-    --page-size (integer) 
-    	The number of results to return in each response to a list operation. The default value is 1000 (the maximum allowed). Using a lower value may help if operation time out.
+-R, -r, --recursive
+   Copy directories recursively
+   
+--page-size (integer) 
+	The number of results to return in each response to a list operation. The default value is 1000 (the maximum allowed). Using a lower value may help if operation time out.
 ```
 
 # Examples

doc/design/file_mananger/pfs/rm.md

@@ -9,11 +9,11 @@ rm [OPTION]... <PFSPath>...
 # Description
 
 ```
-	-r, -R, --recursive 
-		remove directories and their contents recursively
+-r, -R, --recursive 
+	remove directories and their contents recursively
 
-	--page-size (integer) 
-		The number of results to return in each response to a list operation. The default value is 1000 (the maximum allowed). Using a lower value may help if an operation times out	
+--page-size (integer) 
+	The number of results to return in each response to a list operation. The default value is 1000 (the maximum allowed). Using a lower value may help if an operation times out	
 ```
 
 # Examples

doc/design/file_mananger/pfs/sync.md

@@ -8,15 +8,15 @@ sync - sync directories. Recursively copies new and updated files from the sourc
 # Description
 
 ```
-	-l, --links                 
-		copy symlinks as symlinks
+--preserve--links
+   Reserve links when copy links
 ```
 
 # Examples
 - The following command sync locally directory to pfs
 
 ```
-sync ./dir1 pfs://mydir1
+paddle pfs sync ./dir1 pfs://mydir1
 ```
 
 Output
@@ -30,7 +30,7 @@ upload ./dir1/text2.txt to pfs://mydir1/text2.txt
 - The following command sync pfs directory to local
 
 ```
-sync pfs://mydir1 .
+paddle pfs sync pfs://mydir1 .
 ```
 
 Output