[tex-k] glaring error in Appendix E of The METAFONTbook

[胡亚捷 (Hu Yajie)]

Page C305, lines 14--15
Change
    serif_fit:=0pt#;             % extra sidebar near serifs
    letter_fit:=0pt#;            % extra space added to all sidebars
to
    serif_fit#:=0pt#;             % extra sidebar near serifs
    letter_fit#:=0pt#;            % extra space added to all sidebars
because page C308 implies that these variables have both sharped and unsharped
forms (and because cmr10.mf generates lots of errors without these # signs).

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Previous reports:
https://github.com/dine2014/texbook-mfbook-bugs/blob/master/bugs.md
Long-term project: check the validity of syntaxes in the mfbook against mf.web