doc: mgmt: mcumgr: Fix double maps

Fixes an issue where double maps were shown for some items,
and one whereby there was excess text.

Signed-off-by: Jamie McCrae <jamie.mccrae@nordicsemi.no>

doc/services/device_mgmt/smp_groups/smp_group_1.rst

@@ -223,10 +223,8 @@ CBOR data of request:
 .. code-block:: none
 
     {
-        {
-            (str,opt)"hash"     : (str)
-            (str)"confirm"      : (bool)
-        }
+        (str,opt)"hash"     : (str)
+        (str)"confirm"      : (bool)
     }
 
 If "confirm" is false or not provided, an image with the "hash" will be set for
@@ -267,14 +265,12 @@ CBOR data of request:
 .. code-block:: none
 
     {
-        {
-            (str,opt)"image"    : (uint)
-            (str,opt)"len"      : (uint)
-            (str)"off"          : (uint)
-            (str,opt)"sha"      : (byte str)
-            (str,opt)"data"     : (byte str)
-            (str,opt)"upgrade"  : (bool)
-        }
+        (str,opt)"image"    : (uint)
+        (str,opt)"len"      : (uint)
+        (str)"off"          : (uint)
+        (str,opt)"sha"      : (byte str)
+        (str,opt)"data"     : (byte str)
+        (str,opt)"upgrade"  : (bool)
     }
 
 where:
@@ -412,9 +408,7 @@ CBOR data of request:
 .. code-block:: none
 
     {
-        {
-            (str,opt)"slot"     : (uint)
-        }
+        (str,opt)"slot"     : (uint)
     }
 
 where:

doc/services/device_mgmt/smp_groups/smp_group_8.rst

@@ -511,7 +511,6 @@ CBOR data of successful response:
 
 .. code-block:: none
 
-    format (0 = int, 1 = byte array)
     {
         (str)"types" : {
             (str)<hash_checksum_name> : {