Remove renderEra. Rename prettyTo* to docTo* functions

[carbolymer]

Changelog

- description: |
    - Remove `renderEra` Use `docToText . pretty` instead.
    - Rename `prettyTo*` functions to `docTo*`
# uncomment types applicable to the change:
  type:
  # - feature        # introduces a new feature
   - breaking       # the API has changed in a breaking way
  # - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
   - improvement    # QoL changes e.g. refactoring
  # - bugfix         # fixes a defect
  # - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  # - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

Context

This PR introduces consistency in prettyprinting functions naming and simplifies rendering of names of eras.

How to trust this PR

Highlight important bits of the PR that will make the review faster. If there are commands the reviewer can run to observe the new behavior, describe them.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. See Running tests for more details
• Self-reviewed the diff

[carbolymer]

Those functions weren't accepting Pretty a => a but Doc so their names were misleading and it was resulting in oddities like: prettyToString . pretty

[carbolymer]

Now Pretty instance does not print Era suffix which makes it suitable to use in console logging and error messages building.