[Gnu-arch-users] more help message inconsistencies

[Jani Monoses]

in -H messages 

1)join-branch 
         says version in the usage line but revision is used
further on in the text

2)set-tree-version 
         mentions invalid -R switch

3)lock-revision
        uses version in the last line instead of revision

4)library-config
        has "(by default)" at --sparse instead of --non-greedy

5)valid-package-name
        references inexistent -b option (maybe it should handle it as parse
package name does?)

Jani