Update db.collection.findOneAndUpdate.txt

scores ==> grades

Author: zhugw

source/reference/method/db.collection.findOneAndUpdate.txt

@@ -117,7 +117,7 @@ and increments the score by ``5``:
 
 .. code-block:: javascript
 
-   db.scores.findOneAndUpdate(
+   db.grades.findOneAndUpdate(
       { "name" : "R. Stiles" },
       { $inc: { "points" : 5 } }
    )
@@ -153,7 +153,7 @@ matching document with the least points.
 
 .. code-block:: javascript
 
-   db.scores.findOneAndUpdate(
+   db.grades.findOneAndUpdate(
       { "name" : "A. MacDyver" },
       { $inc : { "points" : 5 } },
       { sort : { "points" : 1 } }
@@ -175,7 +175,7 @@ The following operation uses projection to only display the ``_id``,
 
 .. code-block:: javascript
 
-   db.scores.findOneAndUpdate(
+   db.grades.findOneAndUpdate(
       { "name" : "A. MacDyver" },
       { $inc : { "points" : 5 } },
       { sort : { "points" : 1 }, projection: { "assignment" : 1, "points" : 1 } }
@@ -199,7 +199,7 @@ The following operation sets a 5ms time limit to complete the update:
 .. code-block:: javascript
 
    try {
-      db.scores.findOneAndUpdate(
+      db.grades.findOneAndUpdate(
          { "name" : "A. MacDyver" },
          { $inc : { "points" : 5 } },
          { sort: { "points" : 1 }, maxTimeMS : 5 };
@@ -227,7 +227,7 @@ document if nothing matches the ``filter``:
 .. code-block:: javascript
 
    try {
-   db.scores.findOneAndUpdate(
+   db.grades.findOneAndUpdate(
       { "name" : "A.B. Abracus" },
       { $set: { "name" : "A.B. Abracus", "assignment" : 5}, $inc : { "points" : 5 } },
       { sort: { "points" : 1 }, upsert:true, returnNewDocument : true }