docs(build-with-agents): tighten install-step wording

Drop the 'same terminal you'd use for git or npm' aside and replace the
em-dash parenthetical listing the agents with plain parentheses.

Author: onsclom

showcase/shell-docs/src/content/snippets/shared/guides/build-with-agents.mdx

@@ -22,13 +22,13 @@ The full [skills directory](https://github.com/CopilotKit/CopilotKit/tree/main/s
   <Step>
     ### Install the skills
 
-    Run this from the root of the project you're building in — the same terminal you'd use for `git` or `npm`:
+    Run this from the root of the project you're building in:
 
     ```bash
     npx skills add CopilotKit/CopilotKit/skills -y
     ```
 
-    This installs the skills into your project, where any coding agent working there — Claude Code, Codex, Cursor, or Gemini CLI — discovers them automatically. There's no per-agent configuration to do.
+    This installs the skills into your project, where any coding agent working there (Claude Code, Codex, Cursor, or Gemini CLI) discovers them automatically. There's no per-agent configuration to do.
 
     <Callout type="info">
       Want to choose what gets installed? Run `npx skills add CopilotKit/CopilotKit/skills` without `-y` to pick specific skills, target agents, and scope interactively — or add `-g` to install globally for every project.