'va' Alone: minor revision

- air bottle → oxygen bottle
- fixed the spelling of airlock (used to have 'air lock' in some places)

va-Alone-Lena_death.html

@@ -75,7 +75,7 @@
   Emily and Lena start putting on their space suits. Emily is done
   relatively quickly while Lena makes slow progress as she struggles to
   keep her balance. Half-way through, she gives up, sitting down on the
-  bench across from the air lock. Emily helps her all the way into the
+  bench next to the airlock. Emily helps her all the way into the
   suit. Lena sits there for a moment, heavily breathing, while Emily waits.
   <br />
   <span class="quote speech">Sorry, I can&apos;t... I feel exhausted.</span>
@@ -84,7 +84,7 @@
   Emily takes their helmets and brings them into the airlock. She returns
   for a life support unit, pulls it out of the rack in the wall, and sets
   it down on the floor. Following a mental checklist, she makes sure that
-  the air bottle is connected properly and the gauges read what they
+  the oxygen bottle is connected properly and the gauges read what they
   should. Everything okay... or is it? She double-checks with the check
   list on the wall. Yes, this unit is ready. She triple-checks everything
   &ndash; first time it actually matters. Reasonably satisfied with her
@@ -146,7 +146,7 @@
 <p>
   The conversation is interrupted by the beeping of Lena&apos;s low oxygen
   alarm going off. Emily gets up and walks back to the habitat. She enters
-  through the airlock and looks for a full air bottle. She lifts one
+  through the airlock and looks for a full oxygen bottle. She lifts one
   out of its rack and carries it back to Lena. She opens the life support
   unit and closes the valves on it and the empty bottle, then she replaces
   it and opens the valves again. Just as she is done with that, her own