Fix typos per PR 15649. Also did some rewording for clarity.

PR:		docs/15649
Submitted by:	Kazuo Horikawa <horikawa@jp.FreeBSD.org>

1 files changed, 19 insertions, 17 deletions

diff --git a/share/man/man4/ng_vjc.4 b/share/man/man4/ng_vjc.4
index 768dc80..618489f 100644
--- a/share/man/man4/ng_vjc.4
+++ b/share/man/man4/ng_vjc.4
@@ -56,9 +56,9 @@ hook represents the uncompressed side of the node, while the
 .Dv vjuncomp ,
 and
 .Dv vjip
-nodes represent the compressed side of the node. Packets received on the
+hooks represent the compressed side of the node.  Packets received on the
 .Dv ip
-will be compressed or passed through as appropriate. Packets received
+will be compressed or passed through as appropriate.  Packets received
 on the other three hooks will be uncompressed as appropriate.
 This node also supports
 .Dq always pass through
@@ -70,7 +70,7 @@ Only
 (i.e., common case) TCP packets are actually compressed.
 These are output on the
 .Dv vjcomp
-hook. Other TCP packets are run through the state machine but not
+hook.  Other TCP packets are run through the state machine but not
 compressed; these appear on the
 .Dv vjuncomp
 hook.
@@ -85,7 +85,7 @@ node, the
 .Dv vjcomp , 
 and
 .Dv vjip
-nodes should be connected to the
+hooks should be connected to the
 .Xr ng_ppp 8
 node's
 .Dv vjc_ip ,
@@ -93,7 +93,7 @@ node's
 .Dv vjc_vjuncomp ,
 and
 .Dv vjc_ip
-nodes, respectively.
+hooks, respectively.
 .Sh HOOKS
 This node type supports the following hooks:
 .Pp
@@ -113,7 +113,7 @@ This node type supports the generic control messages, plus the following:
 This command resets the compression state and configures it according
 to the supplied
 .Dv "struct ngm_vjc_config"
-argument. This structure contains the following fields:
+argument.  This structure contains the following fields:
 .Bd -literal -offset 4n
 struct ngm_vjc_config {
   u_char   enableComp;    /* Enable compression */
@@ -149,21 +149,22 @@ mode.
 When enabling compression,
 .Dv maxChannel
 should be set to the number of outgoing compression channels minus one,
-and is a value between 3 and 15, inclusive. Also, the
+and is a value between 3 and 15, inclusive.  The
 .Dv compressCID
-field indicates whether it is OK to compress the CID field for
-outgoing compressed TCP packets. This value should be zero unless
-either (a) it not possible for an incoming frame to be lost, or
-(b) lost frames can be reliably detected and a
+field indicates whether it is OK to compress the CID header field for
+outgoing compressed TCP packets.  This value should be zero unless
+either (a) it is not possible for an outgoing frame to be lost, or
+(b) lost frames can be reliably detected and immediately
+reported to the peer's decompression engine (see
 .Dv NGM_VJC_RECV_ERROR
-message is immediately sent whenever this occurs.
+below).
 .It Dv NGM_VJC_GET_STATE
 This command returns the node's current state described by the
 .Dv "struct slcompress"
 structure, which is defined in
 .Pa net/slcompress.h .
 .It Dv NGM_VJC_CLR_STATS
-Clears the node statistics counters. Statistics are also cleared whenever the
+Clears the node statistics counters.  Statistics are also cleared whenever the
 .Dv enableComp
 or
 .Dv enableDecomp
@@ -171,11 +172,12 @@ fields are changed from zero to one by a
 .Dv NGM_VJC_SET_CONFIG
 control message.
 .It Dv NGM_VJC_RECV_ERROR
-When the
-.Dv compressCID
-is set to one, this message must be sent to the node immediately
+When the peer has CID header field compression enabled,
+this message must be sent to the local
+.Nm vjc
+node immediately
 after detecting that a received frame has been lost, due to a bad
-checksum or for any other reason. Failing to do this can result
+checksum or for any other reason.  Failing to do this can result
 in corrupted TCP stream data.
 .Sh SHUTDOWN
 This node shuts down upon receipt of a