Update Tutorial Docs: PolicyActor -> Policy Actor

[Jack-Khuu]

2 Minor Tutorial Edits:

• Changed PolicyActor to Policy Actor: PolicyActor isn't a true class; Actor is the subclass of Policy
  i.e. Policy(ForgeActor)
• Updated import statement to alias Generator to Policy
from forge.actors.generator import Generator as Policy
  • Usage of "Policy" as variables/RL concept is intentionally unchanged

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.74%. Comparing base (633b219) to head (47d01c2).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #436      +/-   ##
==========================================
+ Coverage   64.69%   64.74%   +0.05%     
==========================================
  Files          79       79              
  Lines        7775     7772       -3     
==========================================
+ Hits         5030     5032       +2     
+ Misses       2745     2740       -5     

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[joecummings]

? Why not just keep as Generator everywhere?

[Jack-Khuu]

Because our docs/tutorials are written with Policy as the logical component and I wanted to avoid a mass change.

If we think it's worth it, we can do another pass pushing the abstraction deeper