[lldb] Fix typo on the BreakpointLocation header and the lldbtest.py (NFC)

Summary:
This commit fixes some typo I found while exploring LLDB's codebase.

Signed-off-by: Med Ismail Bennani <medismail.bennani@gmail.com>

Subscribers: lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D66452

llvm-svn: 369313