follow-freq() unfinished sentence fix (#95)

The sentence referring to floating numbers was unfinished.

Author: HofiOne

_includes/doc/admin-guide/options/follow-freq.md

@@ -8,5 +8,4 @@ This is useful for files which always indicate readability, even though
 no new lines were appended. If this value is higher than zero, syslog-ng
 will not attempt to use poll() on the file, but checks whether the file
 changed every time the follow-freq() interval (in seconds) has elapsed.
-Floating-point numbers (for example, **1.5**.
-
+Floating-point numbers (for example, **1.5**) can be used as well.