doc: clarify the pr --page-width descriptions

* doc/coreutils.texi (pr invocation): Clarify that -w or -W
will be rounded down so that each column has the same width.
Adjust the wording for -W, to avoid the implication that the
width of -S is insignificant to the page width.
* src/pr.c (usage): Add a period to avoid ambiguity in
the man page output.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/pr.c b/src/pr.c
index 3f9d1deae..1515b4a47 100644
--- a/src/pr.c
+++ b/src/pr.c
@@ -2820,7 +2820,8 @@ Paginate or columnate FILE(s) for printing.\n\
       fputs (_("\
   -s[CHAR], --separator[=CHAR]\n\
                     separate columns by a single character, default for CHAR\n\
-                    is the <TAB> character without -w and \'no char\' with -w\n\
+                    is the <TAB> character without -w and \'no char\' with -w.\
+\n\
                     -s[CHAR] turns off line truncation of all 3 column\n\
                     options (-COLUMN|-a -COLUMN|-m) except -w is set\n\
 "), stdout);