Add Context.canLeakMemory() + injectAsAppCtx() doc
Add Context.canLeakMemory() + injectAsAppCtx() doc

This commit also removes the Deprecation warning on injectAsAppCtx()
while also broadening its scope from Application to any
non leaking Context.

LouisCAD/Splitties,LouisCAD/Splitties,LouisCAD/Splitties