[vte] parser: Improve documentation of XTERM_CHECKSUM_MODE

[Christian Persch <chpe src gnome org>]

commit a688882382d6484e790ea87aa713c012970280b0
Author: Christian Persch <chpe src gnome org>
Date:   Thu Sep 27 20:15:24 2018 +0200

    parser: Improve documentation of XTERM_CHECKSUM_MODE
    
    https://gitlab.gnome.org/GNOME/vte/issues/24

 src/vteseq.cc | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/vteseq.cc b/src/vteseq.cc
index 442ef1d3..58a9441b 100644
--- a/src/vteseq.cc
+++ b/src/vteseq.cc
@@ -8125,6 +8125,7 @@ Terminal::XTERM_CHECKSUM_MODE(vte::parser::Sequence const& seq)
          *     4: checksum trailing blanks
          *     8: don't checksum empty cells
          *     16: no 8-bit masking or ignoring combining characters
+         *     32: no 7-bit masking
          *
          * Defaults:
          *   args[0]: 0, matching the output from VTxxx terminals