Fixed casing in titles

Author: hhariri

_data/examples.yml

@@ -26,9 +26,9 @@
   url: lambdas
 - title: Named Arguments
   url: namedArguments
-- title: Let Function
+- title: let Function
   url: letFunction
-- title: with function
+- title: with Function
   url: withFunction
 - title: Inheritance
   url: inheritance

_examples/letFunction.md

@@ -1,5 +1,5 @@
 ---
-title: let function
+title: let Function
 ---
 
 *let()* is a useful function defined in Kotlin standard library. It can be used for scoping and null-checks. 

_examples/withFunction.md

@@ -1,5 +1,5 @@
 ---
-title: with function
+title: with Function
 ---
 
 *with* is a function defined in the standard library that can be used to access members of an object in a more concise way, avoiding having to