docs: remove trailing whitespace

 doc/riverctl.1 | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/doc/riverctl.1 b/doc/riverctl.1
index 4b8e49d..df59ffb 100644
--- a/doc/riverctl.1
+++ b/doc/riverctl.1
@@ -18,7 +18,7 @@ is a command-line interface inspired by bspc from bspwm used to control and conf
 .B close
 Close the focused view.
 
-.TP 
+.TP
 .B exit
 Exit the compositor, terminating the Wayland session.
 
@@ -29,12 +29,12 @@ Focus next or previous output.
 
 .TP
 .B focus-view \c
-.BR next | previous  
+.BR next | previous
 Focus next or previous view in the stack.
 
 .TP
 .B layout \c
-.BR top-master | right-master | bottom-master | left-master | full 
+.BR top-master | right-master | bottom-master | left-master | full
 Change the view layout.
 
 .TP
@@ -88,7 +88,7 @@ in base 10 as argument but
 .I tagmasks
 are best understood in binary:
 000000001 means that the first tag is visible;
-111111111 means that tag 1 through 9 are visible. 
+111111111 means that tag 1 through 9 are visible.
 
 .TP
 .BI set-focused-tags " tagmask"