barcode: Fix inaccurate comment and remove redundant info

These comments reproduce the data in the match patterns immediately
below them which makes for errors like this. Better to let the match arm
patterns speak for themselves.

Author: flihp

barcode/src/lib.rs

@@ -835,12 +835,12 @@ impl<'a> TryFrom<&'a str> for Barcode<'a> {
 
         // the prefix determines permitted formats for the part number
         match prefix {
-            // 0XV1 must be in v1 format
+            // must be in v1 format
             Prefix::ZeroXV1 => match part {
                 Part::V1(_) => (),
                 _ => return Err(Self::Error::PartNotV1),
             },
-            // 0XV1, 0XV2 and PDV2 must be in v2 format
+            // must be in v2 format
             Prefix::PDV1 | Prefix::ZeroXV2 | Prefix::PDV2 => match part {
                 Part::V2(_) => (),
                 _ => return Err(Self::Error::PartNotV2),
@@ -867,12 +867,12 @@ impl<'a> TryFrom<&'a str> for Barcode<'a> {
 
         // the prefix determines permitted formats for the serial number
         match prefix {
-            // 0XV1 or PDV1: must be in v1 format
+            // must be in v1 format
             Prefix::ZeroXV1 | Prefix::PDV1 => match serial {
                 Serial::V1(_) => (),
                 _ => return Err(Self::Error::SerialNotV1),
             },
-            // 0XV2 or PDV2: may be in v1 or v2 format
+            // may be in v1 or v2 format
             Prefix::ZeroXV2 | Prefix::PDV2 => match serial {
                 Serial::V1(_) | Serial::V2(_) => (),
             },