runtime(doc): tweak documentation style a bit

closes: #15371

Signed-off-by: h-east <h.east.727@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 52714da..8f8f70a 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 9.1.  Last change: 2024 Jul 24
+*options.txt*	For Vim version 9.1.  Last change: 2024 Jul 28
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -5919,17 +5919,17 @@
 		    Using CTRL-X on "0" or CTRL-A on "18446744073709551615"
 		    (2^64 - 1) has no effect, overflow is prevented.
 	blank	If included, treat numbers as signed or unsigned based on
-		preceding whitespace. If a number with a leading dash has its
+		preceding whitespace.  If a number with a leading dash has its
 		dash immediately preceded by a non-whitespace character (i.e.,
 		not a tab or a " "), the negative sign won't be considered as
 		part of the number.  For example:
 		    Using CTRL-A on "14" in "Carbon-14" results in "Carbon-15"
 		    (without "blank" it would become "Carbon-13").
 		    Using CTRL-X on "8" in "Carbon -8" results in "Carbon -9"
-		    (because -8 is preceded by whitespace. If "unsigned" was
+		    (because -8 is preceded by whitespace.  If "unsigned" was
 		    set, it would result in "Carbon -7").
 		If this format is included, overflow is prevented as if
-		"unsigned" were set. If both this format and "unsigned" are
+		"unsigned" were set.  If both this format and "unsigned" are
 		included, "unsigned" will take precedence.
 
 	Numbers which simply begin with a digit in the range 1-9 are always