Add SROS show port description multiline support

[mjbear]

resolves #2305

Add/fix support for alcatel_sros multiline show port description lines.

[matt852]

Recommendation: Changes Suggested

@mjbear thoughts on this agentic suggestion and how viable it is?

• Simplify the modified header rule. The new (\s*\S*\s*\S*) group extends the match by at most two trailing tokens, so a header like Port Descriptions on Card 1 Module 2 Foo Bar would still fail to match. \s+.+ matches any trailing content and reads more clearly; tests pass locally with this change.

  In ntc_templates/templates/alcatel_sros_show_port_description.textfsm, the header rule in Start:

  -  ^Port\s+Descriptions\s+on\s\S+\s+\S+(\s*\S*\s*\S*)\s*$$ 
  +  ^Port\s+Descriptions\s+on\s+.+$$

Thanks!

[mjbear]

* **Simplify the modified header rule.** The new `(\s*\S*\s*\S*)` group extends the match by at most two trailing tokens,

This was designed to match the "Port Cross Connect 1" text and still be backwards compatible with two-word port names.

Port Descriptions on Port Cross Connect 1

so a header like Port Descriptions on Card 1 Module 2 Foo Bar would still fail to match. \s+.+ matches any trailing content and reads more clearly; tests pass locally with this change.

There are more words in the foo bar example than we see in actual output.

Nothing wrong with some simplification. ❤️
Maybe we don't even need to anchor on the end of the line?

(So instead of the first two, just the last one in green.)

-  ^Port\s+Descriptions\s+on\s\S+\s+\S+(\s*\S*\s*\S*)\s*$$ 
-  ^Port\s+Descriptions\s+on\s+.+$$
+  ^Port\s+Descriptions\s+on

Thank you for the review