[Orgmode] Backslash in a table breaks export to Docbook

[Nigel Beck]

I have a variety of org docs that tend to get infected with latex over
time.  Occasionally I'll export them to other formats, with different
kinds of cleanup.  Along the way I noticed this...  Create the following
doc:

* Change History

| \rowcolor[gray]{.8}Updated By | Date         | Changes Made |
|-------------------------------+--------------+--------------|
| /                             | <>           | <>           |
| Check                         | Nov 18, 2010 | Test         |


Export to docbook via C-c C-e D

Get "Invalid use of '\' in replacement text"

The above is the minimum set to reproduce it  - obviously the first doc
had all the relevant latex includes to make rowcolor[gray] actually work