even though .Bl is not callable, groff complains when it appears

unescaped on a macro line, so lets just escape it;
noticed by jmc@

1 files changed, 1 insertions, 1 deletions

diff --git a/mdoc.7 b/mdoc.7
index 3dfb42aa..709b7a9a 100644
--- a/mdoc.7
+++ b/mdoc.7
@@ -449,7 +449,7 @@ in the alphabetical
 .Op Fl offset Ar val
 .Op Fl compact
 .It Sx \&It Ta list item (syntax depends on Fl Ar type )
-.It Sx \&Ta Ta table cell separator in Sx Bl Fl column No lists
+.It Sx \&Ta Ta table cell separator in Sx \&Bl Fl column No lists
 .It Sx \&Rs , \&%* , \&Re Ta bibliographic block (references)
 .El
 .Ss Spacing control