mercurial: remove dynamic caveats

See Homebrew/brew#20135

Author: MikeMcQuaid

Formula/m/mercurial.rb

@@ -47,14 +47,14 @@ def install
     bash_completion.install share/"bash-completion/completions/hg"
   end
 
-  def caveats
+  def post_install
     return unless (opt_bin/"hg").exist?
     return unless deps.all? { |d| d.build? || d.test? || d.to_formula.any_version_installed? }
 
     cacerts_configured = `#{opt_bin}/hg config web.cacerts`.strip
     return if cacerts_configured.empty?
 
-    <<~EOS
+    opoo <<~EOS
       Homebrew has detected that Mercurial is configured to use a certificate
       bundle file as its trust store for TLS connections instead of using the
       default OpenSSL store. If you have trouble connecting to remote