[tex-k] typos in The METAFONTbook & all my previous reports

[胡亚捷 (Hu Yajie)]

Page C241, line 2
Change `\mode="cheapo"' to `\mode=cheapo'.

Page C243, line 10
Change `labels(0,1,2,3,4)' to `labels(0, 1, 2, 3, 4)' [also on previous page].

------ the following are suggestions ------

Page C243, line 16
Change `begingroup' to `begingroup save region;'

Page C246, answer 14.15
Put space after the `/'s?

Page C266, lines 1--2
Mixing typewriter and fancy tokens in a single sentence seems strange.

Incidentally, all my previous reports (public and private) are listed at
https://github.com/dine2014/texbook-mfbook-bugs/blob/master/bugs.md