EEP48, EEP 58 and EEP 61 are outdated

[William Fank Thomé]

The following EEPs are outdated:

• EEP 48: Documentation storage and format: it's in draft and standards track, but the docs says EDoc implements EEP-48;
• EEP 58: Map Comprehension: stills on the standards track but the feature is in OTP 26;
• EEP 61: Built-in dynamic type: same as EEP 58.

[Raimo Niskanen]

@williamthome: Does PR #52 seem right to you?

[William Fank Thomé]

Thanks, @RaimoNiskanen.