trivial: fix bad redirects (left source/ in the from)

Author: kay-kim

config/redirects

@@ -1382,8 +1382,8 @@ raw: /master/release-notes/3.0-general-improvements -> ${base}/release-notes/3.0
 [v4.0-*]: /${version}/core/security-mongodb-cr -> ${base}/${version}/core/security-scram
 [v4.0-*]: /${version}/reference/command/authSchemaUpgrade  -> ${base}/${version}/core/security-scram
 [v4.0-*]: /${version}/reference/command/copydbgetnonce  -> ${base}/${version}/reference/command/copydb
-[v4.0-*]: /${version}/source/reference/command/resync -> ${base}/${version}/core/master-slave
-[v4.0-*]: /${version}/source/reference/program/mongoperf -> ${base}/${version}/reference/program
+[v4.0-*]: /${version}/reference/command/resync -> ${base}/${version}/core/master-slave
+[v4.0-*]: /${version}/reference/program/mongoperf -> ${base}/${version}/reference/program
 
 
 # 2.8 compatibility