doc: fix --enable-single-binary configure help

* configure.ac: Fix optional indication with square brackets.

diff --git a/configure.ac b/configure.ac
index bbe0c007d18c0ffd6637e3825a87778e30612b85..25fabe49d6991008826273c818ef2a8c9baa6982 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -105,7 +105,7 @@ AC_DEFUN([gl_GCC_VERSION_IFELSE],
 )
 
 AC_ARG_ENABLE([single-binary],
-  [AS_HELP_STRING([--enable-single-binary=[shebangs|symlinks|hardlinks]],
+  [AS_HELP_STRING([--enable-single-binary@<:@=shebangs|symlinks|hardlinks@:>@],
      [Compile all the tools in a single binary, reducing the overall size.
       When compiled this way, shebangs (default when enabled), symlinks, or
       hardlinks are installed for each tool, which point to a single binary])],