fix: openapi changes - remove defunct 'delete stake' entry - add descriptions - fix typos

[NoahMaizels]

Checklist

• [ x] I have read the coding guide.
• [ x] My change requires a documentation update, and I have done it.
• [ ] I have added tests to cover my changes.
• [x ] I have filled out the description and linked the related issues.

Description

Made multiple small changes to OpenAPI specs.

1. openapi/SwarmCommon.yaml
   • Line 38 - "exceeds" corrected to exceed
2. openapi/SwarmDebug.yaml
   • Line 678 - "xDai" changed to "xDAI" for consistency
   • Line 703 - Added "description" field to explain "amount"
   • Line 709 - Added "description" field to explain "address"
   • Line 715 - Added "description" field to explain "{coin}"
   • Line 1064 Removed entire "delete" section

Motivation and Context (Optional)

General improvement of OpenAPI specs

[nikipapadatou]

@NoahMaizels what's the motivation for this change? The /stake endpoint is one that is currently being used.

[istae]

closing because this API is needed

[istae]

@gacevicljubisa can you help @NoahMaizels merge this PR? btw we should not remove the stake "Delete" endpoint as this is needed