KT-5292 Expand selection should have kdoc + method as a stop point

KT-3947 Extend selection works badly with comment

 #KT-5292 Fixed
 #KT-3947 Fixed

idea/testData/wordSelection/SimpleComment/0.kt

@@ -0,0 +1,7 @@
+package p
+
+/* This is a <caret>comment */
+fun foo() {
+}
+
+fun bar(){}

idea/testData/wordSelection/SimpleComment/1.kt

@@ -0,0 +1,7 @@
+package p
+
+/* This is a <selection><caret>comment</selection> */
+fun foo() {
+}
+
+fun bar(){}

idea/testData/wordSelection/SimpleComment/2.kt

@@ -0,0 +1,7 @@
+package p
+
+<selection>/* This is a <caret>comment */</selection>
+fun foo() {
+}
+
+fun bar(){}

idea/testData/wordSelection/SimpleComment/3.kt

@@ -0,0 +1,7 @@
+package p
+
+<selection>/* This is a <caret>comment */
+</selection>fun foo() {
+}
+
+fun bar(){}

idea/testData/wordSelection/SimpleComment/4.kt

@@ -0,0 +1,7 @@
+package p
+
+<selection>/* This is a <caret>comment */
+fun foo() {
+}
+</selection>
+fun bar(){}