Generate Rules.md and md###.md files from metadata, improve Parameters documentation by referencing schema.

doc/md035.md

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+# MD035 - Horizontal rule style
+
+Tags: hr
+
+Aliases: hr-style
+
+Parameters:
+
+* `style`: Horizontal rule style (`string`, default `consistent`)
+
+This rule is triggered when inconsistent styles of horizontal rules are used
+in the document:
+
+```markdown
+---
+
+- - -
+
+***
+
+* * *
+
+****
+```
+
+To fix this, ensure any horizontal rules used in the document are consistent,
+or match the given style if the rule is so configured:
+
+```markdown
+---
+
+---
+```
+
+Note: by default, this rule is configured to just require that all horizontal
+rules in the document are the same and will trigger if any of the horizontal
+rules are different than the first one encountered in the document. If you
+want to configure the rule to match a specific style, the parameter given to
+the 'style' option is a string containing the exact horizontal rule text that
+is allowed.
+
+Rationale: Consistent formatting makes it easier to understand a document.