docs: Update seeds feature documentation

[acheroncrypto]

Problem

seeds feature was renamed to resolution in #2824, but docs site still mention seeds:

anchor/docs/src/pages/docs/manifest.md

Lines 42 to 51 in 1c0b213

	#### seeds
	This tells the IDL to include seed generation for PDA Accounts. The default is `false`
	Example:
	```
	[features]
	seeds = true
	```

Summary of changes

Update the seeds feature documentation:

• Rename it to resolution
• Change the default to true

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