libcurl-multi.3: added missing full stop

Closes #5285
diff --git a/docs/libcurl/libcurl-multi.3 b/docs/libcurl/libcurl-multi.3
index 4674abd..58dd932 100644
--- a/docs/libcurl/libcurl-multi.3
+++ b/docs/libcurl/libcurl-multi.3
@@ -90,7 +90,7 @@
 \fIcurl_multi_fdset(3)\fP that extracts fd_sets from libcurl to use in
 select() or poll() calls in order to get to know when the transfers in the
 multi stack might need attention. Both these APIs allow for your program to
-wait for input on your own private file descriptors at the same time
+wait for input on your own private file descriptors at the same time.
 \fIcurl_multi_timeout(3)\fP also helps you with providing a suitable timeout
 period for your select() calls.