Add PrDoc (auto generated)

prdoc/pr_5361.prdoc

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+crates: []
+doc:
+- audience: TODO
+  description: "After seeing some cases of reported changes that did not happen by\
+    \ the merge request proposer (like https://github.com/paritytech/polkadot-sdk/pull/5339),\
+    \ it became clear that [this](https://github.com/orgs/community/discussions/59677)\
+    \ is probably the issue.  \r\nThe base commit of the SemVer check CI is currently\
+    \ using the *latest* master commit, instead of the master commit at the time when\
+    \ the MR was created. \r\n\r\nTrying to get the correct base commit now. For this\
+    \ to be debugged, i have to wait until another MR is merged into master.\r\n"
+title: '[CI] Fix SemVer check base commit'