Updated RewardsPaid event docs

[hysz]

Description

Clarified the documentation of the epoch parameter for the RewardsPaid event.

Testing instructions

Types of changes

Checklist:

• Prefix PR title with [WIP] if necessary.
• Add tests to cover changes as needed.
• Update documentation as needed.
• Add new entries to the relevant CHANGELOG.jsons.

[alexkroeger]

LGTM based on what I saw on testnet 👍

[buildsize]

File name	Previous Size	New Size	Change
init.py	26.91 KB	26.91 KB	0 bytes (0%)
abi_gen_dummy.ts	184.89 KB	[deleted]
lib_dummy.ts	5.23 KB	[deleted]
test_lib_dummy.ts	14.8 KB	[deleted]
environment.pickle	1.61 MB	1.61 MB	0 bytes (0%)
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