append Formatted Message
@CanIgnoreReturnValue()
Appends the formatted log message of the given log data to the given buffer.
Note that the LogData need not have a template context or arguments, it might just have a literal argument, which will be appended without additional formatting.
Return
the given buffer (for method chaining).
Parameters
data
the log data with the message to be appended.
out
a buffer to append to.