[PLAT-6671] Stub period interpolation doc update
[PLAT-6671] Stub period interpolation doc update

Documenting the limitation to stub period interpolation when there is compounding on the leg
jerome79/OG-Platform,jeorme/OG-Platform,codeaudit/OG-Platform,jerome79/OG-Platform,nssales/OG-Platform,codeaudit/OG-Platform,DevStreet/FinanceAnalytics,nssales/OG-Platform,nssales/OG-Platform,codeaudit/OG-Platform,ChinaQuants/OG-Platform,jeorme/OG-Platform,ChinaQuants/OG-Platform,DevStreet/FinanceAnalytics,nssales/OG-Platform,DevStreet/FinanceAnalytics,DevStreet/FinanceAnalytics,jeorme/OG-Platform,jerome79/OG-Platform,jeorme/OG-Platform,ChinaQuants/OG-Platform,codeaudit/OG-Platform,ChinaQuants/OG-Platform,jerome79/OG-Platform