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

doc/md047.md

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+# MD047 - Files should end with a single newline character
+
+Tags: blank_lines
+
+Aliases: single-trailing-newline
+
+Fixable: Most violations can be fixed by tooling
+
+This rule is triggered when there is not a single newline character at the end
+of a file.
+
+An example that triggers the rule:
+
+```markdown
+# Heading
+
+This file ends without a newline.[EOF]
+```
+
+To fix the violation, add a newline character to the end of the file:
+
+```markdown
+# Heading
+
+This file ends with a newline.
+[EOF]
+```
+
+Rationale: Some programs have trouble with files that do not end with a newline.
+More information: <https://unix.stackexchange.com/questions/18743/whats-the-point-in-adding-a-new-line-to-the-end-of-a-file>.