View Manager - fix yaml documentation

[astroidex]

Describe the bug The yaml Documenation is not complete and with typos. Please fix. https://docs.mapbender.org/develop/en/elements/share/view_manager.html

                    viewmanager:
                        title: View Manager
                        class: Mapbender\CoreBundle\Element\ViewManager
                        publicEntries: rw          # String or empty (falsy value disables public entries entirely); other allowed values are ro (read only), rw (allow read and write), rwd (allow read and write and deletion) (default: ro)
                        privateEntries: true       # Turns user-private states on, with full usage (save, reapply, delete) (default: true)
                        allowAnonymousSave: true   # Extend right to save public entries also to anonymous users (default: false)
                        showDate: true             # Show date of creation or last update in entry listing (default: true)

[astroidex]

@rschwammborn please check the documentation. Looks like the option of the configuration are notr explained in the text.

• see section Configuration

[astroidex]

https://github.com/mapbender/mapbender-documentation/pull/442