doc: improve formatting of command synopses (2/2)

* find/find.1:
* locate/locate.1: Use unbreakable spaces between options and their
  arguments, potentially improving legibility.

The existing synopses are short enough that they don't break in such a
way as to promote confusion even on old-fashioned AT&T troffs that use a
line length of 65n in nroff mode (vs. groff man(7)'s historical 78n and
present-day 80n).  Thus this change merely makes the synopses robust to
future changes.

Discussed at:
https://lists.gnu.org/r/bug-findutils/2025-11/msg00094.html

Copyright-paperwork-exempt: Yes

find/find.1

@@ -10,7 +10,7 @@ find \- search for files in a directory hierarchy
 .RB [ \-H ]
 .RB [ \-L ]
 .RB [ \-P ]
-.RB [ \-D
+.RB [ \-D\ \c
 .IR debugopts ]
 .RB [ \-O\c
 .IR level ]

locate/locate.1

@@ -15,7 +15,7 @@ locate \- list files in databases that match a pattern
 .nr sA \n(.j \" Save the adjustment mode.
 .na
 .B locate
-.RB [ \-d
+.RB [ \-d\ \c
 .I path
 |
 .BI \*%\-\-database= path\c
@@ -40,7 +40,7 @@ locate \- list files in databases that match a pattern
 .RB [ \-b
 |
 .BR \*%\-\-basename ]
-.RB [ \-l
+.RB [ \-l\ \c
 .I N
 |
 .BI \*%\-\-limit= N\c
@@ -51,9 +51,9 @@ locate \- list files in databases that match a pattern
 .RB [ \-r
 |
 .BR \*%\-\-regex ]
-.RB \*%[ \-\-regextype
+.RB \*%[ \-\-regextype\ \c
 .IR R ]
-.RB \*%[ \-\-max\-database\-age
+.RB \*%[ \-\-max\-database\-age\ \c
 .IR D ]
 .RB [ \-P
 |