xbps-reconfigure.1: fix invalid escape

bin/xbps-reconfigure/xbps-reconfigure.1

@@ -37,7 +37,7 @@ option is specified.
 Configures all packages.
 .It Fl C, Fl -config Ar dir
 Specifies a path to the XBPS configuration directory.
-If the first character is not '\/' then it's a relative path of
+If the first character is not '/' then it's a relative path of
 .Ar rootdir .
 .It Fl d, Fl -debug
 Enables extra debugging shown to stderr.