doc: be concise about about std.real2integer / std.real2time

lib/libvmod_std/vmod.vcc

@@ -195,16 +195,21 @@ Example
 $Function INT real2integer(REAL r, INT fallback)
 
 Description
-	Converts the real *r* to an integer. If conversion fails,
+	Rounds the real *r* to the nearest integer, but round halfway
+	cases away from zero (see round(3)). If conversion fails,
 	*fallback* will be returned.
 Example
 	set req.http.integer = std.real2integer(1140618699.00, 0);
+	set req.http.posone = real2integer( 0.5, 0);	# =  1.0
+	set req.http.negone = real2integer(-0.5, 0);	# = -1.0
 
 $Function TIME real2time(REAL r, TIME fallback)
 
 Description
-	Converts the real *r* to a time. If conversion fails,
-	*fallback* will be returned.
+	Rounds the real *r* to the nearest integer (see
+	`func_real2integer`_) and returns the corresponding time when
+	interpreted as a unix epoch. If conversion fails, *fallback*
+	will be returned.
 Example
 	set req.http.time = std.real2time(1140618699.00, now);