docs: fix typo in river(1) man page

 doc/river.1.scd | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/river.1.scd b/doc/river.1.scd
index 0b36fff..4a04860 100644
--- a/doc/river.1.scd
+++ b/doc/river.1.scd
@@ -48,7 +48,7 @@ river will send SIGTERM to this process group.
 
 Usually this executable is a shell script invoking *riverctl*(1) to create
 mappings, start programs such as a layout generator or status bar, and
-preform other configuration.
+perform other configuration.
 
 # ENVIRONMENT