Walkthrough text updates and quickstart.sh missing space fix

[trepel]

Small walkthrough text upades
Added missing space - the if does not work as expected without it

[codecov]

Codecov Report

Merging #413 (387eb50) into main (45b81bb) will not change coverage.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #413   +/-   ##
=======================================
  Coverage   66.26%   66.26%           
=======================================
  Files          38       38           
  Lines        3901     3901           
=======================================
  Hits         2585     2585           
  Misses       1129     1129           
  Partials      187      187           

Flag	Coverage Δ
unit	60.69% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
api/v1beta1 (u)	∅ <ø> (∅)
pkg/common (u)	78.59% <ø> (ø)
pkg/istio (u)	37.11% <ø> (ø)
pkg/log (u)	31.81% <ø> (ø)
pkg/reconcilers (u)	33.44% <ø> (ø)
pkg/rlptools (u)	56.46% <ø> (ø)
controllers (i)	71.39% <ø> (ø)

[adam-cattermole]

Changes look good to me, thanks!