[Excel](data types) How to create lambda methods (#5128)

* first draft lamda methods for Excel

* move file to correct location

* fix broken links

* Apply suggestions from code review

Co-authored-by: Linda Cannon <[email protected]>

* Apply suggestions from code review

Co-authored-by: Linda Cannon <[email protected]>

* Apply suggestions from code review

Co-authored-by: Linda Cannon <[email protected]>

* updates made from review feedback.

* update to latest API changes for reference methods

* Rewrites for API changes

* fix image links

* Apply suggestions from code review

Co-authored-by: Linda Cannon <[email protected]>

* fixes from edit review

* alt text fix

---------

Co-authored-by: Linda Cannon <[email protected]>

Author: davidchesnut

docs/excel/excel-add-ins-dot-functions.md

@@ -498,6 +498,9 @@ items:
         - name: Entity value cards
           href: excel/excel-data-types-entity-card.md
           displayName: Excel
+        - name: Add lambda methods for dot function notation
+          href: excel/excel-add-ins-dot-functions.md
+          displayName: Excel  
     - name: Data validation
       href: excel/excel-add-ins-data-validation.md
       displayName: Excel