fix formatting + name protocols appropriately

Author: alexpyattaev

docs/art/tvu.bob

@@ -1,28 +1,28 @@
                                                                          +------------+
                                                                          |   Gossip   |
                                                                          |   Service  |
-                                 +-------------+                         |            |
-                                 |Child        |    +------------+       +-+-----+----+
-                                 |Validators   |    |Neighborhood|         |     ^
-                                 |             |    |Validators  |         |     |
-                                 +-------+-----+    |            |         |     |
-                                         ^          +---------+--+     Peer|     |Votes
-                                         |                    ^        List|     |
-                                         +-----------------+  |            |     |
-                                       shreds(forward=true)|  |            |     |
+                          +-------------+                                |            |
+                          |Child        |           +------------+       +-+-----+----+
+                          |Validators   |           |Neighborhood|         |     ^
+                          |             |           |Validators  |         |     |
+                          +-------+-----+           |            |         |     |
+                                  ^                 +---------+--+     Peer|     |Votes
+                                  |                           ^        List|     |
+                                  +------------------------+  |            |     |
+                                   shreds(forward = true)  |  |            |     |
                          +---------------------------------------------------------------------------------------------+
                          |                                 |  |            |     |                                     |
                          |  TVU                            |  |   +--------+     |                                     |
                          |                                 |  |   v              |                                     |
 +------------+           |  +-------+  +------------+    +-+--+---+---+      +---+--------------+      +-------------+ |
-|            |    Repair |  |       |  |            |    | Retransmit |      | Replay           |      | Transaction | |
+|            |   Repair  |  |       |  |            |    | Retransmit |      | Replay           |      | Transaction | |
 | Upstream   +------------->+       +->+ Shred      +--->+ Stage      +----->+ Stage            +----->+ Status      | |
-| Validators |     TVU   |  | Shred |  | Verify     |    |            |      | +--------------+ |      | Service     | |
+| Validators |  Turbine  |  | Shred |  | Verify     |    |            |      | +--------------+ |      | Service     | |
 |            +------------->+ Fetch |  | Leader Sig |    +------+-----+      | | PoH Verify   | |      | (optional)  | |
 |            |           |  | Stage |  | Stage      |           ^            | | TX Sig Verify| |      +-------------+ |
 |            +------------->+       |  |            |           |            | |              | |                      |
-|            |   TVU     |  |       |  +--+---------+           |            | +-+------------+ |                      |
-+------------+   Forwards|  +-------+     ^                     |            |   |              |                      |
+|            |  Turbine  |  |       |  +--+---------+           |            | +-+------------+ |                      |
++------------+  Forwards |  +-------+     ^                     |            |   |              |                      |
                          |                |                     |            +------------------+                      |
                          |                |                     |                |                                     |
                          |                |                     |                |                                     |

docs/src/validator/tvu.md

@@ -6,8 +6,9 @@ pagination_label: Validator's Transaction Validation Unit (TVU)
 ---
 
 TVU (Transaction Validation Unit) is the logic of the validator
-responsible for validating and propagating blocks and processing
-those blocks' transactions through the runtime.
+responsible for propagating blocks between validators and ensuring that
+those blocks' transactions reach the replay stage. Its principal external
+interface is the turbine protocol.
 
 ![TVU Block Diagram](/img/tvu.svg)
 
@@ -53,6 +54,7 @@ In the `ContactInfo` struct, all sockets are identified by a tag/key, e.g.:
 ```rust
 const SOCKET_TAG_TVU: u8 = 10;       // For UDP
 const SOCKET_TAG_TVU_QUIC: u8 = 11;  // For QUIC
+```
 
  * `set_socket()` creates a `SocketEntry` and stores that into `ContactInfo::sockets`
  * `set_socket()` updates `ContactInfo::cache`