Add missing block in AT-TLS configuration

[pablocarle]

Describe your pull request here:

• Remove redundant table of contents from AT-TLS articles in v3 and v2.18 (already available in sidebar)
• Add missing block from inbound AT-TLS rules

List the file(s) included in this PR:

• docs/user-guide/configuring-at-tls-for-zowe-server.md
• versioned_docs/version-v2.18.x/user-guide/configuring-at-tls-for-zowe-server.md

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[taban03]

I'd also add example of the TTLSKeyringParms parameter block that is currently missing in the doc. I.E.

{
    ...
    TTLSKeyringParmsRef ZoweKeyring
}

TTLSKeyringParms ZoweKeyring
{
  Keyring ZOWERING
}

[taban03]

I've also noted that TTLSSignatureParms is not documented anywhere. Is it always required?

[pablocarle]

TTLSSignatureParms

I believe this can be removed, can you also confirm in your setup? We should aim at the simplest setup possible

[pablocarle]

I'd also add example of the TTLSKeyringParms parameter block that is currently missing in the doc. I.E.

{
    ...
    TTLSKeyringParmsRef ZoweKeyring
}

TTLSKeyringParms ZoweKeyring
{
  Keyring ZOWERING
}

Thanks, I'll check this one and add it

[taban03]

TTLSConnectionAction ClientConnectionAction  
{  
  HandshakeRole Client  
  TTLSCipherParmsRef CipherParms  
  TTLSConnectionAdvancedParmsRef ConnectionAdvancedParms  
  CertificateLabel  
}

Is CertificateLabel required? Also, it looks it misses the value

[taban03]

TTLSConnectionAdvancedParms ApimlClientX509ConnAdvParms
{
  ApplicationControlled Off
  CertificateLabel Zowe Server
  SecondaryMap Off
}

ApplicationControlled Off is missing in our internal setup. Maybe that won't be necessary.

[taban03]

ClientEnvironmentAdvParms and ServerEnvironmentAdvParms are also not documented.

[pablocarle]

ClientEnvironmentAdvParms and ServerEnvironmentAdvParms are also not documented.

these are documented in the full example