info: clarify same-named conflicts and shadowed formulae

[HaraldNordgren]

Remove the incorrect warning of, which I believe is a remnant of before Terraform was moved out our core:

Conflicts with:
  terraform

❯ brew info terraform
==> hashicorp/tap/terraform ↑: 1.9.7 → stable 1.15.5
Terraform
https://www.terraform.io/
Installed (on request)
From: https://github.com/hashicorp/homebrew-tap/blob/HEAD/Formula/terraform.rb
Tap: hashicorp/tap
==> Installed Kegs and Versions
hashicorp/tap/terraform ↑ 1.9.7 → 1.15.5 (5 files, 87.9MB) [Linked]

Clarify that shadowed pkg's install status and show "Installed Kegs and Versions" even when not real siblings if they occupy the same disk space:

❯ brew info weave
==> weave ↑: 0.1.6 → stable 0.2.7, HEAD
Warning: `weave` shadows `homebrew/core/weave`.
Entity-level semantic merge driver for Git — resolves conflicts by understanding code structure
https://github.com/Ataraxy-Labs/weave
Installed (on request)
From: https://github.com/ataraxy-labs/homebrew-tap/blob/HEAD/Formula/weave.rb
Tap: ataraxy-labs/tap
License: MIT OR Apache-2.0
==> Installed Kegs and Versions
ataraxy-labs/tap/weave ↑ 0.1.6 → 0.2.7 (11 files, 92.6MB) [Linked]

❯ brew info homebrew/core/weave
==> homebrew/core/weave ✘: stable 0.3.5 (bottled), HEAD
Entity-level semantic merge driver for Git using tree-sitter
https://github.com/Ataraxy-Labs/weave
Not installed
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/w/weave.rb
License: MIT OR Apache-2.0
==> Installed Kegs and Versions
ataraxy-labs/tap/weave ↑ 0.1.6 → 0.2.7 (11 files, 92.6MB) [Linked]

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