Update marketing metrics page MQL fields

Why is this change being made?

Changes the Marketing Metrics Page to reflect our current MQL date

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sites/handbook/source/handbook/marketing/strategy-performance/marketing-metrics/index.html.md

@@ -63,7 +63,7 @@ There is a set of fields that show information regarding the First Order (FO) st
 ##### Date of MQL
-To find the date of when someone became an MQL, we use the date field from Marketo (`Marketo MQL DateTime` in SFDC). While this field is not stampted and can change if someone re-MQLs, it makes our reporting eaiser to understand, matches what SalesDev uses, and matches the data in Marketo.
+To find the date of when someone became an MQL, we use the date field from Marketo (`Marketo MQL DateTime` in SFDC). While this field is not stampted and can change if someone re-MQLs, it makes our reporting easier to understand, matches what Sales Development uses, and matches the data in Marketo.
 While we use `Marketo MQL DateTime` for all our standard reporting, we are aware of some of the issues with using this field: 
 - MQL Dates can change if a person re-MQLs