feat(nns): Update self describing proposal descriptions

[jasonz-dfinity]

Update the proposal descriptions based on several rules:

• Match NNS Dapp
• Use imperative form - they describe actions, e.g. "A proposal to change ..." => "Change", "Updates ..." => "Update ..."
• Did not use the ManageNetworkEconomics text from the NNS Dapp, but kept the rewritten one to avoid listing every parameter - they easily get out-dated.

[github-actions]

This pull request changes code owned by the Governance team. Therefore, make sure that
you have considered the following (for Governance-owned code):

1. Update unreleased_changelog.md (if there are behavior changes, even if they are
   non-breaking).

2. Are there BREAKING changes?

3. Is a data migration needed?

4. Security review?

How to Satisfy This Automatic Review

1. Go to the bottom of the pull request page.

2. Look for where it says this bot is requesting changes.

3. Click the three dots to the right.

4. Select "Dismiss review".

5. In the text entry box, respond to each of the numbered items in the previous
   section, declare one of the following:

• Done.

• $REASON_WHY_NO_NEED. E.g. for unreleased_changelog.md, "No
  canister behavior changes.", or for item 2, "Existing APIs
  behave as before.".

Brief Guide to "Externally Visible" Changes

"Externally visible behavior change" is very often due to some NEW canister API.

Changes to EXISTING APIs are more likely to be "breaking".

If these changes are breaking, make sure that clients know how to migrate, how to
maintain their continuity of operations.

If your changes are behind a feature flag, then, do NOT add entrie(s) to
unreleased_changelog.md in this PR! But rather, add entrie(s) later, in the PR
that enables these changes in production.

Reference(s)

For a more comprehensive checklist, see here.

GOVERNANCE_CHECKLIST_REMINDER_DEDUP

[daniel-wong-dfinity-org]

Yup. Looks like this just changes some copy. I haven't looked at the new content. I will leave it to Dylan to approve that. This is just a rubber stamp.

N/A behind feature flag