[tex-k] typo in Volume B: "a 8x8 table"

[胡亚捷 (Hu Yajie)]

Module 764 of Volume B begins with the following sentence:

    The inter-element spacing in math formulas depends on a 8 x 8 table ...

Since "8 x 8" is pronounced as "eight times eight" or "eight by eight",
should it be preceded by "an" instead of "a"?

----

Previous reports:
https://github.com/dine2014/texbook-mfbook-bugs/blob/master/bugs.md