remove square backet to required parameter

Required parameter don't need to square backet, therefore, I remove them.

Change-Id: I36517fb782da53b3b973f70f292f25a4f6784077

Author: zheng yin

doc/source/command-objects/container.rst

@@ -104,7 +104,7 @@ Set container properties
 
     os container set
         [--property <key=value> [...] ]
-        [<container>]
+        <container>
 
 .. option:: --property <key=value>
 
@@ -123,7 +123,7 @@ Display container details
 .. code:: bash
 
     os container show
-        [<container>]
+        <container>
 
 .. describe:: <container>
 
@@ -139,7 +139,7 @@ Unset container properties
 
     os container unset
         [--property <key>]
-        [<container>]
+        <container>
 
 .. option:: --property <key>
 

doc/source/command-objects/object.rst

@@ -60,7 +60,7 @@ List objects
         [--limit <limit>]
         [--long]
         [--all]
-        <container>]
+        <container>
 
 .. option:: --prefix <prefix>
 
@@ -104,8 +104,8 @@ Save object locally
 
     os object save
         [--file <filename>]
-        [<container>]
-        [<object>]
+        <container>
+        <object>
 
 .. option:: --file <filename>
 
@@ -130,7 +130,7 @@ Set object properties
     os object set
         [--property <key=value> [...] ]
         <container>
-        [<object>]
+        <object>
 
 .. option:: --property <key=value>
 
@@ -175,7 +175,7 @@ Unset object properties
     os object unset
         [--property <key>]
         <container>
-        [<object>]
+        <object>
 
 .. option:: --property <key>