TPU and TVU docs changes (#30301)

* docs: add tpu and tvu to terminology

* docs: add brief description to tvu doc

docs/src/terminology.md

@@ -344,6 +344,10 @@ A digitally transferable asset.
 
 [Transactions](#transaction) per second.
 
+## tpu
+
+[Transaction processing unit](validator/tpu.md).
+
 ## transaction
 
 One or more [instructions](#instruction) signed by a [client](#client) using one or more [keypairs](#keypair) and executed atomically with only two possible outcomes: success or failure.
@@ -360,6 +364,10 @@ The number of [confirmed blocks](#confirmed-block) since the transaction was acc
 
 A set of [transactions](#transaction) that may be executed in parallel.
 
+## tvu
+
+[Transaction validation unit](validator/tvu.md).
+
 ## validator
 
 A full participant in a Solana network [cluster](#cluster) that produces new [blocks](#block). A validator validates the transactions added to the [ledger](#ledger)

docs/src/validator/tvu.md

@@ -2,6 +2,10 @@
 title: TVU
 ---
 
+TVU (Transaction Validation Unit) is the logic of the validator
+responsible for validating and propogating blocks and processing
+those blocks' transactions through the runtime.
+
 ![TVU Block Diagram](/img/tvu.svg)
 
 ## Retransmit Stage