Parameter descriptions are incomplete

Some optional parameters don't have defaults.
In a few cases that is reasonable (e.g. optional arguments to a function), but in others it is not.

For example, the following optional parameters don't have documented defaults, but should have:

release:branch

• branchName
• password
• pomFileName
• providerImplementations
• releaseManager
• scmManager
• tag
• tagBase (this is implied by the text, but should be shown as a default)
• username

Also, it would be helpful to give examples of some of the above: what is a valid providerImplementations entry? Likewise releaseManager, scmManager?