Revert "Updated sample YAML description"

This reverts commit fa223f9.

Author: akrantz

README.md

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----
-topic: sample
-products:
-- Excel
-- Office 365
-languages:
-- JavaScript
-- HTML
-extensions:
-  contentType: samples
-  createdDate: 11/1/2017 4:03:37 PM
----
 # Custom functions in Excel (Preview)
 
 Custom functions enable you to add new functions to Excel by defining those functions in JavaScript as part of an add-in. Users within Excel can access custom functions just as they would any native function in Excel, such as `SUM()`.