express: Fix a comment in datagram.cxx

[skip ci]

panda/src/express/datagram.cxx

@@ -113,8 +113,8 @@ pad_bytes(size_t size) {
   // Now append the data.
 
   // It is very important that we *don't* do this reserve() operation.  See
-  // the further comments in append_data(), below.  _data.reserve(_data.size()
-  // + size);
+  // the further comments in append_data(), below.
+  //_data.reserve(_data.size() + size);
 
   while (size > 0) {
     _data.push_back('\0');
@@ -146,7 +146,8 @@ append_data(const void *data, size_t size) {
   // actually slows it down on Windows, which takes the reserve() request as a
   // fixed size the array should be set to (!) instead of as a minimum size to
   // guarantee.  This forces the array to reallocate itself with *every* call
-  // to append_data!  _data.reserve(_data.size() + size);
+  // to append_data!
+  //_data.reserve(_data.size() + size);
 
   _data.v().insert(_data.v().end(), (const unsigned char *)data,
                    (const unsigned char *)data + size);