remove pointless comment

Author: jordy25519

sbe-tool/src/main/java/uk/co/real_logic/sbe/generation/rust/LibRsDef.java

@@ -183,7 +183,6 @@ static void generateReadBuf(final Appendable writer, final ByteOrder byteOrder)
             = new LinkedHashSet<>(TYPE_NAME_BY_PRIMITIVE_TYPE_MAP.values());
         final String endianness = byteOrder == LITTLE_ENDIAN ? "le" : "be";
 
-        // get_u8_at
         uniquePrimitiveTypes.remove("u8");
         indent(writer, 0, "\n");
         indent(writer, 1, "#[inline]\n");