[Docs] Replace SVN revisions with lldb versions

Summary: Replaces references to svn commits with the lldb version number those commits first appeared in. Themotivation is to show that these features are no longer that new and can generally be adopted.

Reviewers: JDevlieghere

Subscribers: lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D61778

llvm-svn: 365559