[minor] --errormax doesn't work with nim doc, can give hundreds of errors

[timotheecour]

--errormax doesn't work with nim doc

Example

(nim doc --errormax:1 compiler/canonicalizer.nim 2>&1) | grep Error| wc -l

Current Output

478

Expected Output

1 or 0

Additional Information

• recent devel

[juancarlospaco]

I understand, but are all compiler flags suppose to work with nim doc?.

[timotheecour]

not all, but this one should; it's an annoyance when having 478 errors being shown... it made life harder when working on #13221 for example.

I'm fine with recategorizing as [minor] however