[JOSS Review] Minor typos / wording suggestions

[tmigot]

Connected to openjournals/joss-reviews#10630

Minor typos / wording suggestions

Here are some writing suggestions for the JOSS paper.

• Line 52:
  In contrast with InfiniteOpt.jl that is designed...
  → In contrast to InfiniteOpt.jl, which is designed...

• Line 54:
  Besides, contributing to general-purpose NLP modeling frameworks...
  → Moreover, contributing to general-purpose NLP modeling frameworks...

• Line 57:
  ...shooting methods based on Pontryagin’s Maximum Principle and that heavily rely...
  → ...shooting methods based on Pontryagin’s Maximum Principle, which heavily rely...

• Line 74:
  Direct method tools
  → Direct-method tools

• Line 75:
  Strong direct method implementations:
  → Strong direct-method implementations:

• Line 87:
  PDE’s
  → PDEs

• Line 121:
  arbitrary user defined functions
  → arbitrary user-defined functions

• Line 146:
  Non-regression on complex problems is increasingly driven by OptimalControlProblems.jl, used as a curated problem bank.
  → Regression testing on complex optimal control instances is increasingly supported by OptimalControlProblems.jl, which serves as a curated problem bank.

• Line 162:
  Both approaches resort to iterative solvers...
  → Both approaches rely on iterative solvers...

• Line 163:
  may converge or not, e.g. depending on the initial guess.
  → may or may not converge, e.g., depending on the initial guess.

• Line 181:
  The package serves educational purposes through Tutorials.jl covering topics...
  → The package also serves educational purposes through Tutorials.jl, which covers topics...

• Line 190:
  with contributions from multiple developers across the control-toolbox ecosystem packages
  → with contributions from multiple developers across the control-toolbox ecosystem