Update EIP-6800: Clarify BASIC_DATA layout and update naming

Merged by EIP-Bot.

EIPS/eip-6800.md

@@ -116,7 +116,7 @@ Instead of a two-layer structure as in the Patricia tree, in the Verkle tree we
 | Parameter             | Value   |
 | --------------------- | ------- |
 | BASIC_DATA_LEAF_KEY   | 0       |
-| CODE_KECCAK_LEAF_KEY  | 1       |
+| CODE_HASH_LEAF_KEY    | 1       |
 | HEADER_STORAGE_OFFSET | 64      |
 | CODE_OFFSET           | 128     |
 | VERKLE_NODE_WIDTH     | 256     |
@@ -158,11 +158,11 @@ def get_tree_key_for_basic_data(address: Address32):
     return get_tree_key(address, 0, BASIC_DATA_LEAF_KEY)
 
 # Backwards compatibility for EXTCODEHASH    
-def get_tree_key_for_code_keccak(address: Address32):
-    return get_tree_key(address, 0, CODE_KECCAK_LEAF_KEY)
+def get_tree_key_for_code_hash(address: Address32):
+    return get_tree_key(address, 0, CODE_HASH_LEAF_KEY)
 ```
 
-An account's `version`, `balance`, `nonce` and `code_size` fields are packed in the value found at `BASIC_DATA_LEAF_KEY`:
+An account's `version`, `balance`, `nonce` and `code_size` fields are packed with big-endian encoding in the value found at `BASIC_DATA_LEAF_KEY`:
 
 | Name        | Offset | Size |
 | ----------- | ------ | ---- |
@@ -173,9 +173,9 @@ An account's `version`, `balance`, `nonce` and `code_size` fields are packed in
 
 Bytes `1..4` are reserved for future use.
 
-Note: the code size is stored on 3 bytes. To allow for an extension to 4 bytes without changing the account version is possible, reserved byte #4 should be allocated last.
+The current layout and encoding allow for an extension of `code_size` to 4 bytes without changing the account version.
 
-When any account header field is set, the `version` field is also set to zero. The `code_keccak` and `code_size` fields are set upon contract or EoA creation.
+When any account header field is set, the `version` field is also set to zero. The `codehash` and `code_size` fields are set upon contract or EoA creation.
 
 #### Code