Fix for KT-14736 J2K Incorrect conversion of back ticks in javadoc {@code} tag

#KT-14736 fixed

idea/idea-core/src/org/jetbrains/kotlin/idea/j2k/IdeaDocCommentConverter.kt

@@ -201,7 +201,13 @@ object IdeaDocCommentConverter : DocCommentConverter {
 
             "s", "del" -> MarkdownSpan.wrap("~~")
 
-            "code" -> MarkdownSpan.wrap("`")
+            "code" -> {
+                val innerText = tag.value.text.trim()
+                if (innerText.startsWith('`') && innerText.endsWith('`'))
+                    MarkdownSpan("`` ", " ``")
+                else
+                    MarkdownSpan.wrap("`")
+            }
 
             "a" -> {
                 if (tag.getAttributeValue("docref") != null) {

j2k/testData/fileOrElement/docComments/quoted.java

@@ -2,6 +2,7 @@
  * Start.
  * Plain quote: 'quoted'
  * KT-13818: {@code 'quoted'}
+ * KT-14736: {@code `code quoted`}
  * Code: {@code someCode()}
  * Operators: {@code a > b}
  * String: {@code str = "String"}

j2k/testData/fileOrElement/docComments/quoted.kt

@@ -2,6 +2,7 @@
  * Start.
  * Plain quote: 'quoted'
  * KT-13818: `'quoted'`
+ * KT-14736: `` `code quoted` ``
  * Code: `someCode()`
  * Operators: `a > b`
  * String: `str = "String"`