Clarify segment support limitations for Personal orgs (#2524)

Added note about segment support for Personal orgs.

Author: DanielOrge

docs/organizations/segments.md

@@ -1,4 +1,7 @@
 # Segments
+
+_Segments are not supported for Personal orgs, as Custom Properties are not available in Github for these orgs._
+
 Segments are dimensions that Codacy reads from your provider that organizes repositories into relevant groups for you. Today, Segments is available for: 
 - [GitHub Custom Properties](#github-custom-properties)
 - [Bitbucket Projects](#bitbucket-projects)
@@ -34,4 +37,4 @@ Bitbucket Projects allow you to organize your repositories into relevant context
 After the first sync is done, Bitbucket Projects will continue to be insync with Codacy automatically.
 
 
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+<br><br>