Updates to Medicine Information page

[JayMurdoch]

• Increase heading level
• Amend example to align with AMT v4 - noting v4 is due for release in October 2024. The change in casing of 'injection' dose form will not be reflected until v4 release, however the code 323389000 | Benzylpenicillin is a current and valid SNOMED substance.
• editorial improvements
• clarification on preferred approach using AMT

[dbojicic]

@dt-r and @JayMurdoch, made changes to:

• update the guidance on medicine product identification points 1. and 2. including correcting the examples to implement the guidance and supply form and strength only when additional to information provided in medication code
• updated example Medication-simvastatin in line with this guidance