Fix typographical errors

[Dimitrolito]

Fix Typographical Errors in Documentation and Comments Across Modules

Pull Request Description:

This pull request addresses typographical errors in comments and documentation across multiple files.
These changes ensure grammatical accuracy, improving clarity and readability without introducing functional changes.

Changes Made:

1. 00-intro.md:

   • Corrected "a IBC-client-breaking" to "an IBC-client-breaking."

2. events.go:

   • Updated "a ibc transfer" to "an ibc transfer."

3. keys.go (in multiple modules):

   • Replaced "a SDK specific format" with "an SDK specific format."

4. genesis.go (in multiple locations):

   • Corrected "a identifier string" to "an identifier string."

5. merkle.go:

   • Fixed "a SDK chain" to "an SDK chain."

These changes affect the following files:

• docs/versioned_docs/version-v9.0.x/01-ibc/05-upgrades/00-intro.md
• modules/apps/transfer/keeper/events.go
• modules/core/02-client/types/keys.go
• modules/core/03-connection/types/keys.go
• modules/core/04-channel/types/keys.go
• modules/core/23-commitment/types/merkle.go
• simapp/genesis.go
• testing/simapp/genesis.go

Notes:

• These updates do not impact code functionality or runtime behavior.
• They adhere to grammatical rules for better consistency and professionalism in the repository.

Checklist:

• Targeted PR against the correct branch.
• Linked to a GitHub issue (if applicable).
• Updated relevant documentation and comments.
• Reviewed changes in the GitHub PR explorer.
• Verified grammar corrections for accuracy.