postgresql: replace the use of for formatting templates

bitnami/postgresql/.github/PULL_REQUEST_TEMPLATE.md

@@ -10,18 +10,23 @@
  Also don't be worried if the request is closed or not integrated sometimes the priorities of Bitnami might not match the priorities of the pull request. Don't fret, the open source community thrives on forks and GitHub makes it easy to keep your changes in a forked repo.
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-##### Description of the change
+**Description of the change**
+
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-##### Benefits
+**Benefits**
+
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-##### Possible drawbacks
+**Possible drawbacks**
+
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-##### Applicable issues
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-##### Additional information
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