Fix typo: 'architecure' → 'architecture' in MiniCPM-V 4.0 description

[daher928]

This PR fixes a simple typo in the README.md file in the MiniCPM-V 4.0 section.

Changes:

• Fixed "architecure" → "architecture" in the description of MiniCPM-V 4.0

Description: While reviewing the documentation, I noticed a spelling error in line describing MiniCPM-V 4.0's features. This is a small, non-disruptive documentation improvement that enhances readability.

This is a straightforward typo fix that should not affect any functionality.