Fix typo in README files

[donatik27]

Changes Made

1. File: rust/sealevel/programs/mailbox-test/README.md

• Old: "due to some funky dependency resolution, the building the SBF .so files included some dev dependencies"
• New: "due to some funky dependency resolution, building the SBF .so files included some dev dependencies"
• Removed redundant "the" before "building"

2. File: typescript/helloworld/src/multiProtocolApp/README.md

• Old: "This folder contains an alternative version of the HelloWorld app that intended for use across multiple protocol types"
• New: "This folder contains an alternative version of the HelloWorld app that is intended for use across multiple protocol types"
• Added missing "is" for proper grammar

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