Update cheatsheets

tldr/pg_amcheck

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# pg_amcheck
+
+> Check for corruption in one or more PostgreSQL databases.
+> More information: <https://www.postgresql.org/docs/current/app-pgamcheck.html>.
+
+- Check a specific database:
+
+`pg_amcheck {{dbname}}`
+
+- Check all databases:
+
+`pg_amcheck {{[-a|--all]}}`
+
+- Check databases matching the specified pattern:
+
+`pg_amcheck {{[-d|--database]}} {{pattern}}`
+
+- Check specific tables within a database:
+
+`pg_amcheck {{[-t|--table]}} {{pattern}} {{dbname}}`
+
+- Check specific schemas within a database:
+
+`pg_amcheck {{[-s|--schema]}} {{pattern}} {{dbname}}`
+
+- Display help:
+
+`pg_amcheck {{[-?|--help]}}`