fix: address doc review feedback

- Fix terminology in Concepts.jsx (use "runtime environments" not "cloud VMs")
- Add intro sentence before code example in sandbox overview
- Fix awkward phrasing about tools
- Remove redundant lifecycle link
- Fix "persistance" typo in lifecycle page

Author: beran-t

docs/sandbox.mdx

@@ -6,7 +6,9 @@ description: "Secure runtime environments for AI agents"
 
 A sandbox is an agentic runtime which is an isolated cloud VM under the hood. Sandboxes can start in as little as **~100ms**. Each sandbox has its own [filesystem](/docs/filesystem), can start [processes](/docs/commands), and has internet access with [configurable firewall](/docs/sandbox/internet-access#fine-grained-network-control).
 
-Sandboxes are designed to run thousands of AI agents safely with access to the real-world tools as on your own computer.
+Sandboxes are designed to run thousands of AI agents safely with access to the same tools available on your own computer.
+
+Here's a basic example of creating a sandbox, running Python code, and shutting it down:
 
 <CodeGroup>
 ```js JavaScript & TypeScript
@@ -57,8 +59,6 @@ sbx.kill()
 These are defaults for the [code-interpreter](https://github.com/e2b-dev/code-interpreter) template. [Custom templates](/docs/template/quickstart) can have different CPU/RAM configurations.
 </Note>
 
-See [lifecycle](/docs/sandbox/lifecycle) for timeout configuration.
-
 ## Sandbox capabilities
 
 | Capability | Description |

docs/sandbox/lifecycle.mdx

@@ -11,7 +11,7 @@ The maximum time sandbox can be kept running without being paused is
 - 24 hours on the Pro Tier
 - 1 hour on the Base Tier
 
-For more details, please refer to [sandbox persistance page](/docs/sandbox/persistence#limitations-while-in-beta).
+For more details, please refer to [sandbox persistence page](/docs/sandbox/persistence#limitations-while-in-beta).
 </Warning>
 
 <CodeGroup>

snippets/Concepts.jsx

@@ -4,7 +4,7 @@ export const Concepts = () => {
       href: "/docs/sandbox",
       title: "Sandbox",
       description:
-        "Learn about sandboxes - isolated cloud VMs for running AI-generated code.",
+        "Learn about sandboxes - isolated runtime environments for AI agents.",
       icon: "box",
     },
     {