DOCSP-34286 -- add command explanations

Author: jvincent-mongodb

source/reference/json/file-options-online-archive.txt

@@ -73,13 +73,15 @@ For a full list of available settings, see the API documentation for
 
 Example Online Archive Create Command
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+After you create the file, run the command to create the Online Archive.
 
 .. code-block::
 
     atlas clusters onlineArchive create --file online-archive-create.json --output json
 
 Example Online Archive Update Command
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+After you create the file, run the command to update the Online Archive.
 
 .. code-block::