scripted-diff: rename block and undo functions for consistency

Co-authored-by: Ryan Ofsky <ryan@ofsky.org>
Co-authored-by: Hodlinator <172445034+hodlinator@users.noreply.github.com>

-BEGIN VERIFY SCRIPT-
grep -r -wE 'WriteBlock|ReadRawBlock|ReadBlock|WriteBlockUndo|ReadBlockUndo' $(git ls-files src/ ':!src/leveldb') && \
    echo "Error: One or more target names already exist!" && exit 1
sed -i \
    -e 's/\bSaveBlockToDisk/WriteBlock/g' \
    -e 's/\bReadRawBlockFromDisk/ReadRawBlock/g' \
    -e 's/\bReadBlockFromDisk/ReadBlock/g' \
    -e 's/\bWriteUndoDataForBlock/WriteBlockUndo/g' \
    -e 's/\bUndoReadFromDisk/ReadBlockUndo/g' \
    $(git ls-files src/ ':!src/leveldb')
-END VERIFY SCRIPT-

src/index/base.cpp

@@ -188,7 +188,7 @@ void BaseIndex::Sync()
 
             CBlock block;
             interfaces::BlockInfo block_info = kernel::MakeBlockInfo(pindex);
-            if (!m_chainstate->m_blockman.ReadBlockFromDisk(block, *pindex)) {
+            if (!m_chainstate->m_blockman.ReadBlock(block, *pindex)) {
                 FatalErrorf("%s: Failed to read block %s from disk",
                            __func__, pindex->GetBlockHash().ToString());
                 return;
@@ -256,7 +256,7 @@ bool BaseIndex::Rewind(const CBlockIndex* current_tip, const CBlockIndex* new_ti
     // In the case of a reorg, ensure persisted block locator is not stale.
     // Pruning has a minimum of 288 blocks-to-keep and getting the index
     // out of sync may be possible but a users fault.
-    // In case we reorg beyond the pruned depth, ReadBlockFromDisk would
+    // In case we reorg beyond the pruned depth, ReadBlock would
     // throw and lead to a graceful shutdown
     SetBestBlockIndex(new_tip);
     if (!Commit()) {