Rename Gemma2 topic to Gemma (#10150)

Co-authored-by: Doruk Taneli <doruktaneli@users.noreply.github.com>

Author: DorukTaneli

src/data/roadmaps/ai-engineer/content/gemma2@MNtaY1_kOJHeoWuM-abb4.md

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+# Gemma
+
+Gemma is a family of open-source large language models (LLMs) developed by Google. These models are designed to be lightweight and high-performing, making them suitable for a variety of tasks, including text generation, question answering, and code completion. Gemma models are available in different sizes, allowing developers to select the best model for their specific resource constraints and performance requirements.
+
+Visit the following resources to learn more:
+
+- [@official@Gemma](https://deepmind.google/models/gemma/)