Fix typos in documentation

[Dahka2321]

Changes Made

1. In examples/README.md:

Changed Rethdatabase to Reth database

Before:
Illustrates how to run a standalone RPC server over a Rethdatabase instance

After:
Illustrates how to run a standalone RPC server over a Reth database instance

2. In .config/zepter.yaml:

Removed redundant word "more"

Before:
It looks like one more more checks failed; please check the console output.

After:
It looks like one more checks failed; please check the console output.

Reason for Changes

1. The term "Reth database" should be written as two separate words for better readability and consistency with other documentation.

2. Fixed a duplicate word ("more more") that was likely a typo in the error message.

These changes improve documentation clarity and fix grammatical errors without affecting any functionality.