minor comment improvements

Author: cowtowncoder

src/main/java/com/fasterxml/jackson/core/JsonPointer.java

@@ -174,8 +174,10 @@ public static JsonPointer forPath(JsonStreamContext context,
         if (context == null) {
             return EMPTY;
         }
+        // Otherwise if context was just created but is not advanced -- like,
+        // opening START_ARRAY/START_OBJECT returned -- drop the empty context.
         if (!context.hasPathSegment()) {
-            // one special case; do not prune root if we need it
+            // Except one special case: do not prune root if we need it
             if (!(includeRoot && context.inRoot() && context.hasCurrentIndex())) {
                 context = context.getParent();
             }

src/test/java/com/fasterxml/jackson/failing/JsonPointerOOME736Test.java

@@ -8,6 +8,7 @@ public class JsonPointerOOME736Test extends BaseTest
     // such as https://github.com/nst/JSONTestSuite/blob/master/test_parsing/n_structure_100000_opening_arrays.json
     public void testDeepJsonPointer() throws Exception {
         int MAX_DEPTH = 100000;
+        // Create nesting of 100k arrays
         String INPUT = new String(new char[MAX_DEPTH]).replace("\0", "[");
         JsonParser parser = createParser(MODE_READER, INPUT);
         try {