docs: fix 17 typos in comments and log messages

[Avicennasis]

Summary

Fixes 17 typos in comments and two log-message strings. No functional changes.

util/util.go

• // PostgresToDriverType converts mysql type names ... -> converts Postgres type names ... - the function switches on int2/int4/float4/numeric/varchar/bool, which are Postgres type names.
• // ClickHouseToDriverType converts mysql type names ... -> converts ClickHouse type names ... - the function switches on int8..int64/uint8../float32/fixedstring, which are ClickHouse type names.
• //QueryRowSQL executes SQL query which return single row -> which returns single row (same for QueryTxRowSQL)
• //MySQLError checks if givens error is ... -> if given error is ...
• // SortedGTIDString ... where UUIDs comes in -> where UUIDs come in

pipe/s3.go

Four doc comments still refer to Terrablob, but everything in the file is the S3 pipe (s3Pipe, s3Client, s3Consumer) and Type() returns "s3":

• // s3Consumer consumes messages from Terrablob ... -> from S3 ...
• // Type returns Pipe type as Terrablob -> as S3
• //NewProducer registers a new Terrablob producer -> a new S3 producer
• //NewConsumer registers a new Terrablob consumer -> a new S3 consumer

lock/lock.go

• // is already held then TryLock is noop. -> then TryLockShared is noop. on TryLockShared - the doc block was copy-pasted from TryLock and still names the wrong method.
• Errorf("Lock did not exists on release") -> "Lock did not exist on release"
• Errorf("Lock was not hold by me") -> "Lock was not held by me"

streamer/buffer.go

• // Its time to commit the batch -> // It's time to commit the batch
• //Guarantee that we can loose no more than ... -> we can lose no more than ...
• // log.Debugf("commont format received ... -> "common format received ... (commented-out debug line; CommonFormatEvent is the type involved)

log/log.go

• //def is a instance of default logger -> //def is an instance of default logger

Note for reviewers

Two of these edits are inside Go string literals rather than comments (the Errorf messages in lock/lock.go). They are the only occurrences of those strings in the repository - nothing asserts on them - but flagging so you can review deliberately. Everything else is comment-only.