Add type documentation

types/algorithm.pp

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+# Algorithms supported by dehydrated/letsencrypt
 type Dehydrated::Algorithm = Pattern[/^(rsa|prime256v1|secp384r1)$/]

types/challengetype.pp

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+# Valid challenge types for letsencrypt
 type Dehydrated::Challengetype = Pattern[/^(http-01|dns-01|tls-alpn-01)$/]

types/crt.pp

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+# PEM Certificate
 type Dehydrated::CRT = Pattern[/(?m:.*-+BEGIN CERTIFICATE-+.*-+END CERTIFICATE-+.*)/]

types/csr.pp

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+# PEM CSR
 type Dehydrated::CSR = Pattern[/(?m:.*-+BEGIN CERTIFICATE REQUEST-+.*-+END CERTIFICATE REQUEST-+.*)/]

types/email.pp

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+# match an email address
 type Dehydrated::Email = Pattern[/^(?i:[A-Z0-9_%+"-]+[A-Z0-9._%+"-]+@[A-Z0-9.-]+\.[A-Z]{2,})$/]

types/gitsshurl.pp

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+# Match ssh URLs for git
 type Dehydrated::GitSSHUrl = Pattern[/(?i:^(ssh:\/\/([^\/@]+@)?[^\/]+\/.*|([^@:]+@)?[^:]+:.*))/]

types/hook.pp

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+# Match a filename for a hook, don not follow paths.
 type Dehydrated::Hook = Pattern[/^[^\\\/]+$/]