DOCSP-39633 fixes mongostat table format (#163)

* DOCSP-39633 fixes mongostat table format

* Backticks mongos for clarity

Author: jwilson-mdb

source/mongostat.txt

@@ -617,16 +617,30 @@ average operations per second.
 
    The replication status of the member.
 
-   =========  =========================
-   **Value**  **Replication Type**
-   ---------  -------------------------
-   PRI        :term:`primary`
-   SEC        :term:`secondary`
-   REC        recovering
-   UNK        unknown
-   RTR        mongos process ("router")
-   ARB        :term:`arbiter`
-   =========  =========================
+   .. list-table::
+      :header-rows: 1
+      :widths: 20 80
+
+      * - Value
+        - Replication Type
+
+      * - ``PRI``
+        - :term:`primary`
+
+      * - ``SEC``
+        - :term:`secondary`
+
+      * - ``REC``
+        - recovering
+
+      * - ``UNK``
+        - unknown
+
+      * - ``RTR``
+        - ``mongos`` process ("router")
+
+      * - ``ARB``
+        - :term:`arbiter`
 
 
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