Changed "maturing" to "emerging" for SC

[bplowry]

Summarising discussion:

• value should be what we are, not how our journey is progressing
• we expect that people who are not in a designated leadership role would show traits of "emergent leadership", and this allows for them to use those examples
• it [maturing] works in contrast to LC/PC leadership terms
• SC description should be about "making decent inroads on that journey"
• maturing in the description makes it unclear what the rating should be. If you are maturing as a leader, should your rating be "maturing" or "no brainer" - "maturing as maturing is weird"
• "Obviously the sense of progress as a leader is important here. The actual words used may have different connotations for different people."

"Emerging" was suggested and 5 or so in the Teams chat agreed

[achidlow]

Looks good to me!

[xwipeoutx]

I realised I only changed the SC role for dev. I've gone through and basically find/replaced it where it makes sense. Another quick look @achidlow please? And I'll merge it.