docs: fix formatting in SVM specification (#7437)

fix formatting

Author: LStan

svm/doc/spec.md

@@ -275,7 +275,7 @@ Steps of `load_and_execute_sanitized_transactions`
          - `programs_loaded_for_tx_batch` contains a reference to all the `ProgramCacheEntry`s
             necessary for the transaction. It maintains an `Arc` to the programs in the global
             `ProgramCacheEntry` data structure.
-      6. Call `MessageProcessor::process_message` to execute the
+   6. Call `MessageProcessor::process_message` to execute the
       transaction. `MessageProcessor` is contained in
       solana-program-runtime crate. The result of processing message
       is either `ProcessedMessageInfo` which is an i64 wrapped in a