[PATCH] nextup.3: minor improvements

[Vincent Lefevre <vincent@vinc17.net>]

The current "If x is 0" is a bit misleading because "is" is not the
equality test, while this condition should apply to both -0 and 0.
Replace this condition by "If x is equal to 0".

Replace "Nan" by "NaN" (typography used everywhere else).

Signed-off-by: Vincent Lefevre <vincent@vinc17.net>
---
 man/man3/nextup.3 | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/man/man3/nextup.3 b/man/man3/nextup.3
index 285c2bcda..02fdb9bae 100644
--- a/man/man3/nextup.3
+++ b/man/man3/nextup.3
@@ -38,8 +38,8 @@ is the smallest representable negative number in the corresponding type,
 these functions return \-0.
 If
 .I x
-is 0, the returned value is the smallest representable positive number
-of the corresponding type.
+is equal to 0, the returned value is the smallest representable positive
+number of the corresponding type.
 .P
 If
 .I x
@@ -52,7 +52,7 @@ of the corresponding type.
 .P
 If
 .I x
-is Nan,
+is NaN,
 the returned value is NaN.
 .P
 The value returned by
-- 
2.45.2