[PATCH, doc]: Fix typo.

[Ben Elliston]

I'm committing the following as obvious.  I'm reasonably certain to have
got the intended meaning correct here, but if I haven't, please let me
know.  In the meantime, I don't think this patch will make things
worse. :-)

Cheers, Ben

2008-04-01  Ben Elliston  <bje@au.ibm.com>

        * doc/c-tree.texi (Function Basics): Fix grammatical error.

Index: doc/c-tree.texi
===================================================================
--- doc/c-tree.texi     (revision 133784)
+++ doc/c-tree.texi     (working copy)
@@ -1508,7 +1508,7 @@ whose @code{TREE_VALUE} represents a typ
 
 @item TYPE_NOTHROW_P
 This predicate holds when the exception-specification of its arguments
-if of the form `@code{()}'.
+is of the form `@code{()}'.
 
 @item DECL_ARRAY_DELETE_OPERATOR_P
 This predicate holds if the function an overloaded