pg_waldump: update page

pages/common/pg_waldump.md

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+# pg_waldump
+
+> Display a human-readable rendering of the write-ahead log of a PostgreSQL database cluster.
+> More information: <https://www.postgresql.org/docs/current/pgwaldump.html>.
+
+- Display WAL records from a specific segment:
+
+`pg_waldump {{startseg}}`
+
+- Display WAL records between two segments:
+
+`pg_waldump {{startseg}} {{endseg}}`
+
+- Follow WAL in real-time:
+
+`pg_waldump {{startseg}} {{[-f|--follow]}}`
+
+- Display records with full page images:
+
+`pg_waldump {{startseg}} {{[-w|--fullpage]}}`
+
+- Display summary statistics instead of individual records:
+
+`pg_waldump {{startseg}} {{[-z|--stats]}}`
+
+- Display help:
+
+`pg_waldump {{[-?|--help]}}`
+
+- Display version:
+
+`pg_waldump {{[-V|--version]}}`