docs(guides): change localhost to 127.0.0.1 to avoid error

[agazso]

Description

Using localhost on linux in the SemaphoreEthers constructor causes an error.

Changing it to 127.0.0.1 would make it work everywhere.

Related Issue

https://github.com/semaphore-protocol/semaphore/issues/469

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[vplasencia]

Hey @agazso! Thank you so much!