[goffice] Math: doc fixes.

[Morten Welinder <mortenw src gnome org>]

commit 713e83a64dfc793363de4dd29bfdd1bccd55e05e
Author: Morten Welinder <terra gnome org>
Date:   Wed Dec 18 13:54:14 2013 -0500

    Math: doc fixes.

 goffice/math/go-math.c |   42 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 42 insertions(+), 0 deletions(-)
---
diff --git a/goffice/math/go-math.c b/goffice/math/go-math.c
index 53a163a..1275f45 100644
--- a/goffice/math/go-math.c
+++ b/goffice/math/go-math.c
@@ -945,6 +945,13 @@ do_sin (double x, int k)
 }
 
 
+/**
+ * go_sinpi:
+ * @x: a number
+ *
+ * Returns: the sine of Pi times @x, but with less error than doing the
+ * multiplication outright.
+ */
 double
 go_sinpi (double x)
 {
@@ -953,6 +960,13 @@ go_sinpi (double x)
        return do_sin (x, k);
 }
 
+/**
+ * go_cospi:
+ * @x: a number
+ *
+ * Returns: the cosine of Pi times @x, but with less error than doing the
+ * multiplication outright.
+ */
 double
 go_cospi (double x)
 {
@@ -961,6 +975,13 @@ go_cospi (double x)
        return do_sin (x, k + 1);
 }
 
+/**
+ * go_tanpi:
+ * @x: a number
+ *
+ * Returns: the tangent of Pi times @x, but with less error than doing the
+ * multiplication outright.
+ */
 double
 go_tanpi (double x)
 {
@@ -1031,6 +1052,13 @@ do_sinl (long double x, int k)
 }
 
 
+/**
+ * go_sinpil:
+ * @x: a number
+ *
+ * Returns: the sine of Pi times @x, but with less error than doing the
+ * multiplication outright.
+ */
 long double
 go_sinpil (long double x)
 {
@@ -1039,6 +1067,13 @@ go_sinpil (long double x)
        return do_sinl (x, k);
 }
 
+/**
+ * go_cospil:
+ * @x: a number
+ *
+ * Returns: the cosine of Pi times @x, but with less error than doing the
+ * multiplication outright.
+ */
 long double
 go_cospil (long double x)
 {
@@ -1047,6 +1082,13 @@ go_cospil (long double x)
        return do_sinl (x, k + 1);
 }
 
+/**
+ * go_tanpil:
+ * @x: a number
+ *
+ * Returns: the tangent of Pi times @x, but with less error than doing the
+ * multiplication outright.
+ */
 long double
 go_tanpil (long double x)
 {