Fix typo in index.md (#1811)

Fix grammar and clarity in sentence about ragas in applications

Author: sahusiddharth

docs/howtos/applications/index.md

@@ -1,7 +1,7 @@
 # Applications
 
 Ragas in action. Examples of how to use Ragas in various applications and
-usecases to solve problems you might encounter when your building.
+usecases to solve problems you might encounter when you're building.
 
 
 ## Metrics