fix typo in ReorderBufferProcessTXN

[Hou, Zhijie]

Hi

I found a possible typo in the comment of  ReorderBufferProcessTXN().

* relmapper has no "historic" view, in contrast to normal
* the normal catalog during decoding. Thus repeated

Is there an extra ‘normal’ in the comment ?

in contrast to normal the normal catalog during decoding == >> in contrast to 
the normal catalog during decoding

Best regards,
houzj

0001-fix-typo.patch
Description: 0001-fix-typo.patch