docs: strip spec-provided descriptions and rewrite 9 short/long descriptions

docs/platform/cli.mdx

@@ -1,7 +1,7 @@
 ---
 title: "CLI for Terminal Memory Management"
 sidebarTitle: "CLI"
-description: "Manage memories from your terminal, for both humans and AI agents."
+description: "Add, search, list, update, and delete Mem0 memories from your terminal with the npm and pip CLI, including an --agent flag for JSON output."
 icon: "terminal"
 iconType: "solid"
 ---

docs/platform/features/multimodal-support.mdx

@@ -1,7 +1,7 @@
 ---
 title: "Platform Multimodal Support"
 sidebarTitle: "Multimodal Support"
-description: Integrate images and documents into your interactions with Mem0
+description: "Send image_url, pdf_url, txt_url, and mdx_url content to the Mem0 Platform so agents can extract facts from images and documents into memory."
 ---
 
 Mem0 extends its capabilities beyond text by supporting multimodal data, including images and documents. With this feature, users can seamlessly integrate visual and document content into their interactions, allowing Mem0 to extract relevant information from various media types and enrich the memory system.

docs/platform/overview.mdx

@@ -1,7 +1,7 @@
 ---
 title: "Platform Overview"
 sidebarTitle: "Overview"
-description: "Managed memory layer for AI agents, production-ready in minutes"
+description: "Mem0 Platform is the managed memory layer for AI agents: persistent user memory, hosted vector store and rerankers, audit logs, and workspace governance."
 icon: "cloud"
 ---