Docs: Add `/context` command to slash command reference documentation

Title: Docs: Add /context command to slash command reference documentation

Is your feature request related to a problem? Please describe.

The /context command is a valuable tool for helping users understand and debug context-related issues. However, it is currently missing from the main table of built-in slash commands in the official documentation.

While the command is mentioned in the changelog (version 1.0.86), users who rely on the primary /slash-commands page as a reference will not discover it. This makes the documentation incomplete and prevents users from easily finding a key self-service debugging feature.

Describe the solution you'd like

Please add an entry for the /context command to the table of "Built-in slash commands" on the en/docs/claude-code/slash-commands page.

The new entry could look something like this:

| Command | Purpose |
| :--- | :--- |
| /context | Helps debug context-related issues by displaying what Claude sees. |

Describe alternatives you've considered

Users could find the command by reading through the entire changelog, but this is not an efficient or intuitive way to discover available features. The primary command reference page should be the canonical source of truth for all available slash commands.

Additional context

The command was introduced in version 1.0.86 of Claude Code. The official changelog included in the provided documentation confirms this:

## 1.0.86 - Added /context to help users self-serve debug context issues

Adding this to the main list will improve documentation consistency and user experience. Thank you for considering this improvement