[DOCS] Fix list formatting in TESTING.asciidoc (#33889)
[DOCS] Fix list formatting in TESTING.asciidoc (#33889)

Fix the steps listed  in `Testing packaging` to
```
1. step1
2. step2
--------------------------------------
vagrant plugin install vagrant-cachier
--------------------------------------
3. step3
```
instead of
```
instead of:
1. step1
2. step2
--------------------------------------
vagrant plugin install vagrant-cachier
--------------------------------------
1. step3
```
strapdata/elassandra,strapdata/elassandra,strapdata/elassandra,strapdata/elassandra,vroyer/elassandra,vroyer/elassandra,strapdata/elassandra,vroyer/elassandra