pip3 -- the pip program processes both commands (e.g., install) and
options (e.g., --no-index). Expressed option / command descriptions
in the iindicative mood. The imperative mood should only be used to
tell the reader what to do, not in explanatory verbiage. Inserted
the definite article here and there. Corrected a misspelled instance
of the indefinite article: we don't say "an utility" because the
initial phoneme in "utility" is pronounced as YOO.
