Add callee name to diagnostic about illegal suspension call

#KT-15938 Fixed

idea/testData/quickfix/modifiers/suspend/init.kt

@@ -1,5 +1,5 @@
 // "Make bar suspend" "false"
-// ERROR: Suspend functions are only allowed to be called from a coroutine or another suspend function
+// ERROR: Suspend function 'foo' should be called only from a coroutine or another suspend function
 
 suspend fun foo() {}
 

idea/testData/quickfix/modifiers/suspend/topLevel.kt

@@ -1,6 +1,6 @@
 // "Make bar suspend" "false"
 // ACTION: Convert property initializer to getter
-// ERROR: Suspend functions are only allowed to be called from a coroutine or another suspend function
+// ERROR: Suspend function 'foo' should be called only from a coroutine or another suspend function
 
 suspend fun foo() = 42
 val x = <caret>foo()