typo: samling->sampling (#717)

Correct typo samling->sampling

---------

Co-authored-by: Colleen McGinnis <[email protected]>

Author: carsonip

solutions/observability/apps/tail-based-sampling.md

@@ -5,7 +5,7 @@ applies_to:
   stack: all
 ---
 
-# Tail-based sampling [apm-tail-based-samling-config]
+# Tail-based sampling [apm-tail-based-sampling-config]
 
 ::::{note}
 ![supported deployment methods](../../../images/observability-binary-yes-fm-yes.svg "")