golangci-lint: tone down comment checking

39df946c06 was meant to enable stricter comment checking only for cmd/kubeadm
because the maintainers of that want that. However, the exclude rule didn't
capture all possible error texts and therefore some checks were enabled across
the entire code base.

The extended pattern is now based on the golangci-lint source code.

Also, the hint config didn't suppress any of these checks.

hack/golangci-hints.yaml

@@ -67,6 +67,16 @@ issues:
         - gocritic
       text: "ifElseChain: rewrite if-else to switch statement"
 
+    # Only packages listed here opt into the strict "exported symbols must be documented".
+    #
+    # Exclude texts from https://github.com/golangci/golangci-lint/blob/ab3c3cd69e602ff53bb4c3e2c188f0caeb80305d/pkg/config/issues.go#L11-L103
+    - linters:
+        - golint
+        - revive
+        - stylecheck
+      text: comment on exported (method|function|type|const)|should have( a package)? comment|comment should be of the form|comment on exported (method|function|type|const)|should have( a package)? comment|comment should be of the form|exported (.+) should have comment( \(or a comment on this block\))? or be unexported|package comment should be of the form "(.+)...|comment on exported (.+) should be of the form "(.+)...|should have a package comment
+      path-except: cmd/kubeadm
+
 linters:
   disable-all: false
   enable: # please keep this alphabetized