strlcpy/strlcat: Remove references to snprintf

While strlcpy and snprintf are somewhat similar, there's big differences
between strlcat and snprintf which leads to confusion. Remove the
comparison, since it's ultimately not that useful: the snprintf man page
has similar language to strlcpy, so it doesn't provide a better
reference. The two implementations are otherwise unrelated.

Reviewed by:		bcr
Sponsored by:		Netflix
Differential Revision:  https://reviews.freebsd.org/D27228

lib/libc/string/strlcpy.3

@@ -25,7 +25,7 @@
 .\" OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 .\" ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd May 1, 2020
+.Dd October 27, 2023
 .Dt STRLCPY 3
 .Os
 .Sh NAME
@@ -45,9 +45,11 @@ The
 .Fn strlcpy
 and
 .Fn strlcat
-functions copy and concatenate strings with the
-same input parameters and output result as
-.Xr snprintf 3 .
+functions copy and concatenate strings with the same input parameters and output result as
+.Xr strcpy 3
+and
+.Xr strcat 3
+with proper overflow protection.
 They are designed to be safer, more consistent, and less error
 prone replacements for the easily misused functions
 .Xr strncpy 3
@@ -100,22 +102,7 @@ and
 .Fa dst
 strings overlap, the behavior is undefined.
 .Sh RETURN VALUES
-Besides quibbles over the return type
-.Pf ( Va size_t
-versus
-.Va int )
-and signal handler safety
-.Pf ( Xr snprintf 3
-is not entirely safe on some systems), the
-following two are equivalent:
-.Bd -literal -offset indent
-n = strlcpy(dst, src, len);
-n = snprintf(dst, len, "%s", src);
-.Ed
-.Pp
-Like
-.Xr snprintf 3 ,
-the
+The
 .Fn strlcpy
 and
 .Fn strlcat