Fix typo

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

src/frequenz/channels/timer.py

@@ -62,7 +62,7 @@ async def main() -> None:
 
 Tip:
     It is extremely important to understand how timers behave when they are
-    delayed, we recommned emphatically to read about [missed ticks and
+    delayed, we recommend emphatically to read about [missed ticks and
     drifting](#missed-ticks-and-drifting) before using timers in production.
 
 # Missed Ticks And Drifting