Fix typos in code comments and test data

The typos in 005_negotiate_encryption.pl and pg_combinebackup.c
shall be backported to v17 where they were introduced.

Backpatch-through: v17
Discussion: https://postgr.es/m/Ztaj7BkN4658OMxF@paquier.xyz

src/backend/storage/buffer/bufmgr.c

@@ -4741,7 +4741,7 @@ RelationCopyStorageUsingBuffer(RelFileLocator srclocator,
 	bstrategy_src = GetAccessStrategy(BAS_BULKREAD);
 	bstrategy_dst = GetAccessStrategy(BAS_BULKWRITE);
 
-	/* Initalize streaming read */
+	/* Initialize streaming read */
 	p.blocknum = 0;
 	p.nblocks = nblocks;
 	src_smgr = smgropen(srclocator, INVALID_PROC_NUMBER);

src/bin/pg_combinebackup/pg_combinebackup.c

@@ -849,7 +849,7 @@ process_directory_recursively(Oid tsoid,
 	 *
 	 * We set is_pg_wal for the toplevel WAL directory and all of its
 	 * subdirectories, because those files are not included in the backup
-	 * manifest and hence need special treatement. (Since incremental backup
+	 * manifest and hence need special treatment. (Since incremental backup
 	 * does not exist in pre-v10 versions, we don't have to worry about the
 	 * old pg_xlog naming.)
 	 *

src/interfaces/libpq/t/005_negotiate_encryption.pl

@@ -240,7 +240,7 @@ testuser    disable      disable      postgres       connect, authok
 .           .            require      postgres       connect, sslreject          -> fail
 .           .            .            direct         connect, directsslreject    -> fail
 
-# sslnegotiation=direct is not acccepted unless sslmode=require or stronger
+# sslnegotiation=direct is not accepted unless sslmode=require or stronger
 *           *            disable      direct         -     -> fail
 *           *            allow        direct         -     -> fail
 *           *            prefer       direct         -     -> fail
@@ -303,7 +303,7 @@ nossluser   .            disable      postgres       connect, authok
 .           .            require      postgres       connect, sslaccept, authfail                    -> fail
 .           .            require      direct         connect, directsslaccept, authfail              -> fail
 
-# sslnegotiation=direct is not acccepted unless sslmode=require or stronger
+# sslnegotiation=direct is not accepted unless sslmode=require or stronger
 *           *            disable      direct         -     -> fail
 *           *            allow        direct         -     -> fail
 *           *            prefer       direct         -     -> fail
@@ -405,7 +405,7 @@ nogssuser   disable      disable      postgres       connect, authok
 .           .            require      postgres       connect, gssaccept, authfail -> fail   # If both GSSAPI and sslmode are required, and GSS is not available -> fail
 .           .            .            direct         connect, gssaccept, authfail -> fail   # If both GSSAPI and sslmode are required, and GSS is not available -> fail
 
-# sslnegotiation=direct is not acccepted unless sslmode=require or stronger
+# sslnegotiation=direct is not accepted unless sslmode=require or stronger
 *           *            disable      direct         -     -> fail
 *           *            allow        direct         -     -> fail
 *           *            prefer       direct         -     -> fail
@@ -562,7 +562,7 @@ nossluser   disable      disable      postgres       connect, authok
 .           require      *            postgres       connect, gssaccept, authok   -> gss
 .           .            require      direct         connect, gssaccept, authok   -> gss
 
-# sslnegotiation=direct is not acccepted unless sslmode=require or stronger
+# sslnegotiation=direct is not accepted unless sslmode=require or stronger
 *           *            disable      direct         -     -> fail
 *           *            allow        direct         -     -> fail
 *           *            prefer       direct         -     -> fail