Spelling/grammar fixes

[petersmythe]

Level: Low

Describe the bug:
Spelling/grammar. Are these pages available on GitHub for a PR, or must I highlight fixes by listing them below?

Steps To Reproduce:

View https://developer.investec.com/za/programmable-card

Expected behaviour:

• Perform transaction simulations using online the simulator -> Perform transaction simulations using the online simulator
• return false will decline a authorization. -> return false will decline an authorization.
• Apply conditional logic within before transaction method Say -> Apply conditional logic within before transaction method. Say
• for your to interact/communicate -> for you to interact/communicate
• such as updating a external DB -> such as updating an external DB
• Within env.json, you are able to save variable - a variable -> Within env.json, you are able to save a variable
• may be created and available -> may be created and are available
• Once a environment variable has been defined -> Once an environment variable has been defined

Additionally

• main.js requires two methods for card transaction interception
  We might want to review this. Yes, it only requires these 2, but if it doesn't have afterDecline and the transaction is declined, then there is an error in the logs.
• Consistent spelling of "before transaction" and consistent use of back ticks '`' for methods/filenames/code snippets.

[petersmythe]

main.js requires two methods for card transaction interception

See also https://github.com/orgs/Investec-Developer-Community/discussions/14#discussioncomment-9352461

[programmable-banking-community]

Hi Peter. The official docs on developer.investec.com are not publicly editable (yet - we are working on that). In the meantime, the team will take a look at these and see how best we can action them. Thanks again :)