fix: Remove trailing color references

[Jiralite]

Please describe the changes this PR makes and why it should be merged:

• Updated the documentation of RoleManager#fetch() to use colors
• GuildMember#displayColor was always returning 0 as it referenced a non-existent property
• Getting the hexColor of a role will cause a crash as this.color does not exist

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

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2 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
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[vladfrangu]

Does hexColor make sense to keep in its current form?

[almeidx]

This is missing. And the typings do not correspond to the jsdoc / runtime implementation

discord.js/packages/discord.js/src/managers/GuildManager.js

Line 201 in a7f711b

color: color && resolveColor(color),

[Qjuh]

This is missing. And the typings do not correspond to the jsdoc / runtime implementation

discord.js/packages/discord.js/src/managers/GuildManager.js

Line 201 in a7f711b

color: color && resolveColor(color),

That's irrelevant as the route that uses is no longer available and errors either way.