Update best-practices.md (#1104)

Typo on line 32, correction 'From Initiated' to read 'Form initiated' :-).

Author: segment-sv

src/protocols/tracking-plan/best-practices.md

@@ -29,7 +29,7 @@ As an example, you may end up with a list like the following:
 * Link Clicked
 * Article Completed
 * Campaign Opened
-* From Initiated
+* Form Initiated
 * Form Submitted
 * User Signed Up