adding link in policy docs to sample data call

Author: gbinal

Diff for: policy-docs.md

@@ -12,3 +12,6 @@ This section offers examples of policy documents (memos, guidance, manuals, etc)
 * Department of the Interior, ["Memo Re: Implementation of DOI Open Data Policy"](/assets/docs/MEMO_RE_IMPLEMENTATION_OF_DOI_OPEN_DATA_POLICY.pdf). This memo served as the official DOI announcement to all Department Bureaus and Offices of the near-term requirements of M-13-13, and also called for the creation of a Data Services Board to oversee data lifecycle management moving forward.
 
 ## Guidance
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+* [Sample Procedure for an agency-wide data call](http://project-open-data.github.io/assets/docs/sample_data_call_procedure).  
+