Add missing argument in editsnippet help

[Atmois]

Description

Fixes #493.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Other: (write here)

Guidelines

• My code follows the style guidelines of this project (formatted with Ruff)

• I have performed a self-review of my own code

• I have commented my code, particularly in hard-to-understand areas

• I have made corresponding changes to the documentation if needed

• My changes generate no new warnings

• I have tested this change

• Any dependent changes have been merged and published in downstream modules

• I have followed all of these guidelines.

How Has This Been Tested? (if applicable)

N/A

Screenshots (if applicable)

N/A

Additional Information

N/A

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request addresses a minor bug fix in the 'editsnippet' command's usage description. The change adds a missing argument '[content]' to the command usage string, providing a more accurate representation of the command's expected input.

File-Level Changes

Change	Details	Files
Updated the usage string for the 'editsnippet' command to include the missing '[content]' argument	Modified the 'usage' parameter in the @commands.command decorator for the edit_snippet function Changed 'usage="editsnippet [name]"' to 'usage="editsnippet [name] [content]"'	tux/cogs/utility/snippets.py

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[sourcery-ai]

Hey @Atmois - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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