Remove reduntant redirection

doc/development/service_ping/product_intelligence_review.md

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-redirect_to: 'review_guidelines.md'
-remove_date: '2021-09-16'
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-
-This file was moved to [another location](review_guidelines.md).
-
-<!-- This redirect file can be deleted after <2021-09-16>. -->
-<!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->

doc/development/usage_ping/product_intelligence_review.md

 ---
-redirect_to: '../service_ping/product_intelligence_review.md'
+redirect_to: '../service_ping/review_guidelines.md'
 remove_date: '2021-10-09'
 ---
 
-This file was moved to [another location](../service_ping/product_intelligence_review.md).
+This file was moved to [another location](../service_ping/review_guidelines.md).
 
 <!-- This redirect file can be deleted after <2021-10-09>. -->
 <!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->