[Nbd] [PATCHv2 1/2] proto.md: Clearly set out NBDMAGIC is the actual value

[Alex Bligh <alex@...872...>]

Clearly set out NBDMAGIC, not the name of a constant equal to
some value. Set out the value in hex as well.

Document the newstyle magic number is "IHAVEOPT".

Signed-off-by: Alex Bligh <alex@...872...>
---
 doc/proto.md | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/doc/proto.md b/doc/proto.md
index 03dfe2b..8376021 100644
--- a/doc/proto.md
+++ b/doc/proto.md
@@ -67,7 +67,8 @@ newstyle negotiation.
 
 #### Oldstyle negotiation
 
-S: 64 bits, `NBDMAGIC` (also known as the `INIT_PASSWD`)  
+S: 64 bits, `0x4e42444d41474943` (ASCII '`NBDMAGIC`') (also known as
+   the `INIT_PASSWD`)  
 S: 64 bits, `0x00420281861253` (`cliserv_magic`, a magic number)  
 S: 64 bits, size of the export in bytes (unsigned)  
 S: 32 bits, flags  
@@ -96,8 +97,10 @@ production purposes.
 
 The initial few exchanges in newstyle negotiation look as follows:
 
-S: 64 bits, `NBDMAGIC` (as in the old style handshake)  
-S: 64 bits, `0x49484156454F5054` (note different magic number)  
+S: 64 bits, `0x4e42444d41474943` (ASCII '`NBDMAGIC`') (as in the old
+   style handshake)  
+S: 64 bits, `0x49484156454F5054` (ASCII '`IHAVEOPT`') (note different
+   magic number)  
 S: 16 bits, handshake flags  
 C: 32 bits, flags  
 
@@ -113,7 +116,8 @@ At this point, we move on to option haggling, during which point the
 client can send one or (in fixed newstyle) more options to the server.
 The generic format of setting an option is as follows:
 
-C: 64 bits, `0x49484156454F5054` (note same newstyle handshake's magic number)  
+C: 64 bits, `0x49484156454F5054` (ASCII '`IHAVEOPT`') (note same
+   newstyle handshake's magic number)  
 C: 32 bits, option  
 C: 32 bits, length of option data (unsigned)  
 C: any data needed for the chosen option, of length as specified above.  
-- 
1.9.1