DOCSP-29718: typo fix and small copy edits. (#3107) (#3126)

* DOCSP-29718:  typo fix and small copy edits.

* DOCSP-29718: Internal feedback

* DOCSP-29718: Internal feedback

Author: sarah-olson-mongodb

source/reference/operator/aggregation/isNumber.txt

@@ -17,7 +17,7 @@ Definition
 
    .. versionadded:: 4.4
 
-   :expression:`$isNumber` checks if the specified 
+   ``$isNumber`` checks if the specified 
    :ref:`expression <aggregation-expressions>` resolves to one of the
    following numeric :term:`BSON types`:
 
@@ -26,16 +26,15 @@ Definition
    - :bsontype:`Double <Double>`
    - :bsontype:`Long <Int64>`
 
-   :expression:`$isNumber` returns:
+   ``$isNumber`` returns:
 
    - ``true`` if the expression resolves to a number.
 
    - ``false`` if the expression resolves to any other
      :doc:`BSON type </reference/mongodb-extended-json>`, ``null``, or
      a missing field.
 
-   :expression:`$isNumber` has the following 
-   :ref:`operator expression syntax 
+   ``$isNumber`` has the following :ref:`operator expression syntax 
    <agg-quick-ref-operator-expressions>`:
 
    .. code-block:: javascript
@@ -53,20 +52,20 @@ Definition
 Example
 -------
 
-Use :expression:`$isNumber` to Check If A Field Is Numeric
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Use $isNumber to Check if a Field is Numeric
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Issue the following operation against the ``examples.sensors``
 collection to populate test data:
 
 .. code-block:: javascript
 
    db.getSiblingDB("examples").sensors.insertMany([
-     { "_id" : 1, "reading" : NumberDecimal(26.0) }
-     { "_id" : 2, "reading" : NumberLong(25.0) }
-     { "_id" : 3, "reading" : NumberInt(24) }
-     { "_id" : 4, "reading" : 24.0 }
-     { "_id" : 5, "reading" : "24" }
+     { "_id" : 1, "reading" : NumberDecimal(26.0) },
+     { "_id" : 2, "reading" : NumberLong(25.0) },
+     { "_id" : 3, "reading" : NumberInt(24) },
+     { "_id" : 4, "reading" : 24.0 },
+     { "_id" : 5, "reading" : "24" },
      { "_id" : 6, "reading" : [ NumberDecimal(26) ]}
    ])
 
@@ -90,6 +89,7 @@ stage to add the following fields to each document:
 The aggregation operation returns the following results:
 
 .. code-block:: javascript
+   :copyable: false 
 
    { "_id" : 1, "reading" : NumberDecimal("26.0000000000000"), "isNum " : true, "type" : "decimal" }
    { "_id" : 2, "reading" : NumberLong(25), "isNum " : true, "type" : "long" }
@@ -98,8 +98,8 @@ The aggregation operation returns the following results:
    { "_id" : 5, "reading" : "24", "isNum " : false, "type" : "string" }
    { "_id" : 6, "reading" : [ NumberDecimal("26.0000000000000") ], "isNum " : false, "type" : "array" }
 
-Conditionally Modify Fields using :expression:`$isNumber`
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Conditionally Modify Fields using $isNumber
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 The ``grades`` collection contains data on student grades. The ``grade``
 field may either store a string letter grade *or* a numeric point value.
@@ -136,7 +136,7 @@ field may either store a string letter grade *or* a numeric point value.
 The following aggregation uses the :pipeline:`$addFields` stage to add a
 ``points`` field containing the numeric grade value for that course. The
 stage uses the :expression:`$cond` operator to set the value of
-``points`` based on the output of :expression:`$isNumber`:
+``points`` based on the output of ``$isNumber``:
 
 - If ``true``, ``grades`` already contains the numeric point value. 
   Set ``points`` equal to ``grades``.