[m-rev.] for review: Improve compatibility with makeinfo 5.1

[Paul Bone]

For review by anyone (Without knowing texinfo that well, but with the advice
of google this seemed to be the right thing to do).

Improve compatibility with makeinfo 5.1

The newer version of makeinfo is more pedantic about the use of the
@itemx token.  To allow our documentation to compile I've replaced a number
of @itemx tokens with @item toknes.

doc/reference_manual.hexi:
doc/user_guide.texi:
    As above.
---
 doc/reference_manual.texi | 2 +-
 doc/user_guide.texi       | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/doc/reference_manual.texi b/doc/reference_manual.texi
index 6e81b50..98686df 100644
--- a/doc/reference_manual.texi
+++ b/doc/reference_manual.texi
@@ -1290,7 +1290,7 @@ Semantics:
 transform(V_in, V_out, @{ Goal @}) = (Goal, V_out = V_in)
 @end example
 
- at itemx [@var{Term}, @dots{}]
+ at item [@var{Term}, @dots{}]
 A DCG input match.
 Unifies the implicit DCG input variable V_in,
 which must have type @samp{list(_)},
diff --git a/doc/user_guide.texi b/doc/user_guide.texi
index 189f402..c7b311d 100644
--- a/doc/user_guide.texi
+++ b/doc/user_guide.texi
@@ -6883,7 +6883,7 @@ dependencies to @file{@var{module}.dep}, @file{@var{module}.dv} and the
 relevant @samp{.d} files.
 
 @sp 1
- at itemx --generate-dependency-file
+ at item --generate-dependency-file
 @findex --generate-dependency-file
 Output `Make'-style dependencies for the module to @file{@var{module}.d}'.
 
@@ -7061,7 +7061,7 @@ Print the flags with which the C compiler will be invoked
 to the standard output.
 
 @sp 1
- at itemx --output-csharp-compiler-type
+ at item --output-csharp-compiler-type
 @findex --output-csharp-compiler-type
 Print the C# compiler type to the standard output.
 
-- 
1.8.1.3