docs: fix 13 README typos, including invalid HCL in the usage examples

[Avicennasis]

Summary

Fix 13 typos across the module READMEs, including four that make the copy-pasteable Terraform examples invalid.

Broken example code

• kubernetes/README.md (x2) and etcd/README.md (x1): early_renewal_hours" = "720" -> early_renewal_hours = "720"
• kubernetes/README.md (x2): ssh_private_key" = "/ssh/private_key" -> ssh_private_key = "/ssh/private_key"

A stray double quote after the attribute name makes these module blocks fail to parse if copied as-is. The = alignment of the surrounding block is preserved.

Incorrect variable documentation

• docker/README.md: `ip_addresses_list` - List of DNS names for which a certificate is being requested. -> List of IP addresses ...

ip_addresses_list feeds ip_addresses in docker/daemon/main.tf; the module has a separate dns_names_list variable for dns_names, so this description had been copy-pasted from the wrong variable.

Prose

• README.md: TLS certs etcd -> TLS certs for etcd (matches the neighbouring catalog bullets)
• docker/README.md: connect to yor docker daemon -> your docker daemon
• docker/README.md: Assuming you docker daemon is configured -> Assuming your docker daemon
• docker/README.md: test it from on of the clients -> from one of the clients
• kubernetes/README.md and etcd/README.md: A terraform module with contains TLS certificates -> which contains
• ca/README.md: Folder to upload the the CA. -> Folder to upload the CA.

Documentation only - no .tf files were modified.