ci: pgindent the file-format magic comments in open_pg_tde.h

The multi-line trailing comment on OPEN_PG_TDE_WAL_KEY_FILE_MAGIC sat at a
deep indentation where it ran past the line-length limit, so the pgindent
check wanted to rewrap it. Move the rationale into the block comment above
the defines and shorten the trailing comments, which is clearer and keeps
them well under the column limit.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: OffgridwithJD

src/include/open_pg_tde.h

@@ -11,19 +11,14 @@
 #define TDE_TRANCHE_NAME "open_pg_tde_tranche"
 
 /*
- * Only numeric version (the most left byte) should be changed when updating
- * file format. Otherwise, it will break the migration process.
+ * File format magics. Only the numeric version (the most significant byte)
+ * should change when the format changes; otherwise migration breaks. The
+ * current formats (WAL key file v3, SMGR key map file v6) authenticate
+ * key_base_iv in the AEAD additional authenticated data; it was unauthenticated
+ * in the previous formats (WAL v2, map v5).
  */
-#define OPEN_PG_TDE_WAL_KEY_FILE_MAGIC 0x034B4557	/* version ID value = WEK
-													 * 03; v3 authenticates
-													 * key_base_iv in the AEAD
-													 * AAD (was excluded in v2) */
-#define OPEN_PG_TDE_SMGR_FILE_MAGIC		  0x06454454	/* version ID value =
-														 * TDE 06; v6
-														 * authenticates
-														 * key_base_iv in the
-														 * AEAD AAD (was
-														 * excluded in v5) */
+#define OPEN_PG_TDE_WAL_KEY_FILE_MAGIC 0x034B4557	/* "WEK", version 3 */
+#define OPEN_PG_TDE_SMGR_FILE_MAGIC 0x06454454	/* "TDE", version 6 */
 
 #define FILEMAGIC_VERSION(FM) ((FM & 0xF000000) >> 24)
 #define FILEMAGIC_TYPE(FM) ((FM & 0x0FFFFFF))