DOCSP-10823 improve out to s3 (#36)

* DOCSP-10823 improve out to s3

Author: kanchana-mongodb

source/reference/pipeline/out.txt

@@ -167,7 +167,10 @@ Fields
              :ref:`created dynamically <adl-out-stage-egs>` from the
              fields in the documents that reach the |out| stage. Any
              filename expression you provide must evaluate to a
-             ``string`` data type.
+             ``string`` data type. If there are any files on |s3| 
+             with the same name and path as the newly generated files, 
+             |out| overwrites the existing files with the newly 
+             generated files.
 
              .. important::
 
@@ -408,7 +411,7 @@ Examples
                     "$concat": [
                       "persons/",
                       "$name", "/",
-                      "$unique-id"
+                      "$unique-id", "/"
                     ]
                   },
                   "format": {
@@ -423,9 +426,11 @@ Examples
          file, |out| concatenates:
 
          - A constant string ``persons/`` and, from the documents:
+
            - The string value of the ``name`` field,
-           - A forward slash (``/``), and
-           - The string value of the ``unique-id`` field.
+           - A forward slash (``/``), 
+           - The string value of the ``unique-id`` field, and
+           - A forward slash (``/``).
 
          Each |bson| file contains all of the documents with the same
          ``name`` and ``unique-id`` values. |out| names each file using
@@ -458,7 +463,7 @@ Examples
                       {
                         "$toString": "$sale-date"
                       }, "/",
-                      "$part-id"
+                      "$part-id", "/"
                     ]
                   },
                   "format": {
@@ -474,11 +479,14 @@ Examples
          ``sale-date``, and ``part-id`` values.  To name each file, |out|
          concatenates:
 
-         - A constant string value of ``big-box-store``,
+         - A constant string value of ``big-box-store/``,
          - A string value of a unique store number in the
            ``store-number`` field,
-         - A string value of the date from the ``sale-date`` field, and
-         - A string value of part ID from the ``part-id`` field.
+         - A forward slash (``/``),
+         - A string value of the date from the ``sale-date`` field, 
+         - A forward slash (``/``), 
+         - A string value of part ID from the ``part-id`` field, and 
+         - A forward slash (``/``).
 
    .. tab:: Atlas Cluster
       :tabid: atlas
@@ -541,7 +549,7 @@ Examples
                           "to": "string",
                           "onNull": ""
                         }
-                      }
+                      }, "/"
                     ]
                   },
                   "format": {