taking districtm off the download page (prebid#5234)

Author: bretg

dev-docs/bidders/districtm.md

@@ -6,11 +6,11 @@ top_nav_section: dev_docs
 nav_section: reference
 pbjs: true
 biddercode: districtm
-aliasCode : appnexus
 isBidder: true
 gvl_id: 144
 pbjs_version_notes: not supported in 7.0+
 sidebarType: 1
+enable_download: false
 ---
 
 ### Bid Params