Clarify approve_all flag location

[DJAxel]

Specify what class the approve_all flag belongs to.

For me personally, it was not directly clear what class the flag belonged to and I had to inspect the source code. I propose this change to make this more clear in the docs.

[coveralls]

Pull Request Test Coverage Report for Build 5749708730

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 98.712%

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Totals
Change from base Build 5256298947:	0.0%
Covered Lines:	920
Relevant Lines:	932

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💛 - Coveralls