Remove misleading hints about reducing the System V request size.

Since the request size will now be ~48 bytes regardless of how
shared_buffers et. al. are set, much of this advice is no longer
relevant.

src/backend/port/sysv_shmem.c

@@ -167,39 +167,25 @@ InternalIpcMemoryCreate(IpcMemoryKey memKey, Size size)
 					IPC_CREAT | IPC_EXCL | IPCProtection),
 				 (errno == EINVAL) ?
 				 errhint("This error usually means that PostgreSQL's request for a shared memory "
-		  "segment exceeded your kernel's SHMMAX parameter.  You can either "
-						 "reduce the request size or reconfigure the kernel with larger SHMMAX.  "
-				  "To reduce the request size (currently %lu bytes), reduce "
-						 "PostgreSQL's shared memory usage, perhaps by reducing shared_buffers "
-						 "or max_connections.\n"
-						 "If the request size is already small, it's possible that it is less than "
-						 "your kernel's SHMMIN parameter, in which case raising the request size or "
-						 "reconfiguring SHMMIN is called for.\n"
+		  "segment exceeded your kernel's SHMMAX parameter, or possibly that "
+						 "it is less than "
+						 "your kernel's SHMMIN parameter.\n"
 		"The PostgreSQL documentation contains more information about shared "
-						 "memory configuration.",
-						 (unsigned long) size) : 0,
+						 "memory configuration.") : 0,
 				 (errno == ENOMEM) ?
 				 errhint("This error usually means that PostgreSQL's request for a shared "
-				   "memory segment exceeded available memory or swap space, "
-			   "or exceeded your kernel's SHMALL parameter.  You can either "
-						 "reduce the request size or reconfigure the kernel with larger SHMALL.  "
-				  "To reduce the request size (currently %lu bytes), reduce "
-						 "PostgreSQL's shared memory usage, perhaps by reducing shared_buffers "
-						 "or max_connections.\n"
+				   "memory segment exceeded your kernel's SHMALL parameter.  You may need "
+						 "to reconfigure the kernel with larger SHMALL.\n"
 		"The PostgreSQL documentation contains more information about shared "
-						 "memory configuration.",
-						 (unsigned long) size) : 0,
+						 "memory configuration.") : 0,
 				 (errno == ENOSPC) ?
 				 errhint("This error does *not* mean that you have run out of disk space.  "
 						 "It occurs either if all available shared memory IDs have been taken, "
 						 "in which case you need to raise the SHMMNI parameter in your kernel, "
 		  "or because the system's overall limit for shared memory has been "
-				 "reached.  If you cannot increase the shared memory limit, "
-		  "reduce PostgreSQL's shared memory request (currently %lu bytes), "
-				   "perhaps by reducing shared_buffers or max_connections.\n"
+				 "reached.\n"
 		"The PostgreSQL documentation contains more information about shared "
-						 "memory configuration.",
-						 (unsigned long) size) : 0));
+						 "memory configuration.") : 0));
 	}
 
 	/* Register on-exit routine to delete the new segment */