Fix syntax for theme command documentation

[EvilGenius13]

WHY are these changes introduced?

Fixes https://github.com/Shopify/develop-advanced-edits/issues/369

There are some leftover theme commands that show a different pattern on how to call them in our dev docs. They show up as theme: command where the majority of examples refer to the commands as theme command

WHAT is this pull request doing?

Updated examples for console, push and init to use a space instead of :

How to test your changes?

You can see the updated auto-generated documents showing the changes, (README.md, oclif.manifest.json, and example scripts (.sh))
You can double check by pulling down the branch, and running npm run refresh:manifests. There should be no other changes to the generated docs.

Measuring impact

How do we know this change was effective? Please choose one:

• n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix
• Existing analytics will cater for this addition
• PR includes analytics changes to measure impact

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	72.86% (+0.37% 🔼)	8414/11548
🟡	Branches	69.56% (+0.42% 🔼)	4140/5952
🟡	Functions	71.94% (+0.17% 🔼)	2192/3047
🟡	Lines	73.19% (+0.4% 🔼)	7957/10872

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟢	... / deploy.ts	87.18%	85% (-7.86% 🔻)	87.5%	89.19%
🟢	... / versions-list.ts	100%	85.71% (-1.79% 🔻)	100%	100%
🟢	... / admin.ts	82.76% (+1.51% 🔼)	37.5% (-2.5% 🔻)	90%	85.71% (+1.84% 🔼)

Test suite run success

1913 tests passing in 866 suites.

Report generated by 🧪jest coverage report action from 8df131c

[karreiro]

Thank you, @EvilGenius13!