Use user-defined macros in the manual
It is possible to use user-defines macros in order not to write a new time the package title, the package description, etc. For references, it is also possible to replace the href mark by the doi mark.
\packageTitle\packageDescription\packageAuthor\packageMaintainer\packageDESCRIPTION\packageIndices\doi
See Writing R Extensions (User-defined macros)
This avoids, for example, possible differences between the title of the description file and the title of the package's help page.