Minor. Rename and add kdoc for Candidate::onCompletionResultsWritingCallbacks

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/calls/Candidate.kt

@@ -115,9 +115,14 @@ class Candidate(
     var functionTypesOfSamConversions: HashMap<FirExpression, ConeKotlinType>? = null
     lateinit var typeArgumentMapping: TypeArgumentMapping
     val postponedAtoms = mutableListOf<PostponedResolvedAtom>()
+
+    // PCLA-related parts
     val postponedPCLACalls = mutableListOf<FirStatement>()
     val lambdasAnalyzedWithPCLA = mutableListOf<FirAnonymousFunction>()
-    val onCompletionResultsWritingCallbacks = mutableListOf<(ConeSubstitutor) -> Unit>()
+
+    // Currently, it's only about completion results writing for property delegation inference info
+    // See the call sites of [FirDelegatedPropertyInferenceSession.completeSessionOrPostponeIfNonRoot]
+    val onPCLACompletionResultsWritingCallbacks = mutableListOf<(ConeSubstitutor) -> Unit>()
 
     var currentApplicability = CandidateApplicability.RESOLVED
         private set

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/inference/FirPCLAInferenceSession.kt

@@ -123,7 +123,7 @@ class FirPCLAInferenceSession(
     ) {
         outerCandidate.postponedPCLACalls += childCalls
         currentCommonSystem.addOtherSystem(childStorage)
-        outerCandidate.onCompletionResultsWritingCallbacks += onCompletionResultsWriting
+        outerCandidate.onPCLACompletionResultsWritingCallbacks += onCompletionResultsWriting
     }
 
     private fun FirExpression.updateReturnTypeWithCurrentSubstitutor(

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/FirCallCompletionResultsWriterTransformer.kt

@@ -194,7 +194,7 @@ class FirCallCompletionResultsWriterTransformer(
             postponedCall.transformSingle(this, null)
         }
 
-        for (callback in candidate.onCompletionResultsWritingCallbacks) {
+        for (callback in candidate.onPCLACompletionResultsWritingCallbacks) {
             callback(finalSubstitutor)
         }