Display Quick Documentation for reserved words

#KT-9934 Fixed

idea/testData/editor/quickDoc/Lateinit.kt

@@ -0,0 +1,5 @@
+class Foo {
+    <caret>lateinit var foo: String
+}
+
+//INFO: lateinit allows initializing a <a href="http://kotlinlang.org/docs/reference/properties.html#late-initialized-properties-and-variables">non-null property outside of a constructor</a>

idea/testData/editor/quickDoc/LateinitName.kt

@@ -0,0 +1,5 @@
+class Foo {
+    val <caret>lateinit: String = ""
+}
+
+//INFO: <div class='definition'><pre><a href="psi_element://Foo"><code>Foo</code></a><br>public final val <b>lateinit</b>: String</pre></div>

idea/testData/editor/quickDoc/Tailrec.kt

@@ -0,0 +1,5 @@
+<caret>tailrec fun foo() {
+    foo()
+}
+
+//INFO: tailrec marks a function as <a href="http://kotlinlang.org/docs/reference/functions.html#tail-recursive-functions">tail-recursive</a> (allowing the compiler to replace recursion with iteration)

idea/testData/editor/quickDoc/TailrecName.kt

@@ -0,0 +1,5 @@
+class Foo {
+    val <caret>tailrec: String = ""
+}
+
+//INFO: <div class='definition'><pre><a href="psi_element://Foo"><code>Foo</code></a><br>public final val <b>tailrec</b>: String</pre></div>