DOCS-11259: annotate mmapv1 only options

Author: Kay Kim

source/includes/options-mongod.yaml

@@ -544,6 +544,9 @@ name: journalOptions
 args: <arguments>
 directive: option
 description: |
+
+  *Only available for the MMAPv1 storage engine.*
+
   Provides functionality for testing. Not for general use, and will affect data
   file integrity in the case of abnormal system shutdown.
 post: |
@@ -667,6 +670,8 @@ args: null
 directive: option
 description: |
 
+  *Only available for the MMAPv1 storage engine.*
+
   .. deprecated:: 2.6
 
      By default, MongoDB does not preallocate data files. The option
@@ -696,6 +701,9 @@ args: <value>
 default: 16
 directive: option
 description: |
+
+  *Only available for the MMAPv1 storage engine.*
+
   {{verb}} default size for namespace files, which are files that end
   in ``.ns``. Each collection and index counts as a namespace.
 
@@ -712,6 +720,8 @@ name: quota
 args: null
 directive: option
 description: |
+  *Only available for the MMAPv1 storage engine.*
+
   {{verb}} a maximum limit for the number data files each database can
   have. When running with the {{role}} option, MongoDB has a maximum of 8
   data files per database. Adjust the quota with
@@ -727,6 +737,8 @@ args: <number>
 default: 8
 directive: option
 description: |
+  *Only available for the MMAPv1 storage engine.*
+
   {{verb}} limit on the number of data files per database. {{role}}
   option requires that you set {{quota_flag}}.
 optional: true
@@ -841,6 +853,9 @@ name: smallfiles
 args: null
 directive: option
 description: |
+
+  *Only available for the MMAPv1 storage engine.*
+  
   {{intro}} a smaller default file size. The {{role}} option
   reduces the initial size for data files and limits the maximum size to
   512 megabytes. {{role}} also reduces the size of each :term:`journal`