Exception(s) portion of Coding Guideline issue template not propagated to guideline in RST

[PLeVasseur]

@rcseacord reported that the Exception(s) portion of Coding Guideline issue template was not being propagated to guideline in RST

[PLeVasseur]

resolved by:

• fix: include contents of Exceptions(s) in coding guidelines issue template into generated RST guideline #258
• fix: correct indentation process around exception_section #260
• fix: rename exception section to exceptions #262