Fix a few typos and one inconsistent naming issue

[git-hulk]

Except for a few typos in the comment line, this PR also renames the following:

1. Rename newVertexAiSessionService to newVertexAISessionService
2. Rename vertexAiService to vertexAISessionService

Neither of them will introduce the breaking since they are in a private state.

[gemini-code-assist]

Summary of Changes

Hello @git-hulk, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing code quality and readability through a series of minor but impactful adjustments. It addresses several grammatical typos within comments and, more significantly, refines the naming convention for internal Vertex AI service components to ensure consistency and clarity. These changes are entirely internal and do not introduce any breaking changes or alter external behavior.

Highlights

• Typo Corrections: Corrected several minor grammatical typos in comments across internal/httprr/rr.go, memory/service.go, and session/session.go to improve clarity and accuracy.
• Naming Consistency for Vertex AI Services: Standardized the naming of Vertex AI related services and functions by changing newVertexAiSessionService to newVertexAISessionService and vertexAiService to vertexAIService for better adherence to common acronym capitalization practices. These changes are internal and do not introduce breaking changes.

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[gemini-code-assist]

Code Review

This pull request does a great job of fixing several typos and improving naming consistency, which enhances the overall code quality. I've identified an additional opportunity to improve consistency in session/vertexai.go by aligning the struct name with its constructor. My detailed comments provide specific suggestions for this.