doc: Fix name of CRC algorithm in "Reliability" section.

This section claims we use CRC-32 for WAL records and two-phase
state files, but we've actually used CRC-32C since v9.5 (commit
5028f22f6e).  Fix that.

Reviewed-by: Robert Haas
Discussion: https://postgr.es/m/ZrUFpLP-w2zTAHqq%40nathan
Backpatch-through: 12

diff --git a/doc/src/sgml/wal.sgml b/doc/src/sgml/wal.sgml
index 2514982fbb4cf29a7eb3bb3e4c25d2adbebedd4b..7463a87a8e103f5b4c05754f6e15d7fda81b6d2c 100644 (file)
--- a/doc/src/sgml/wal.sgml
+++ b/doc/src/sgml/wal.sgml
@@ -185,7 +185,7 @@
    
     
      
-      Each individual record in a WAL file is protected by a CRC-32 (32-bit) check
+      Each individual record in a WAL file is protected by a CRC-32C (32-bit) check
       that allows us to tell if record contents are correct. The CRC value
       is set when we write each WAL record and checked during crash recovery,
       archive recovery and replication.
@@ -211,7 +211,7 @@
     
     
      
-      Individual state files in pg_twophase are protected by CRC-32.
+      Individual state files in pg_twophase are protected by CRC-32C.