Changed walkthrough from UPS to mini

[zulandar]

This PR is a

• Feature Implementation
• Bug Fix
• Documentation

What this PR does / why we need it:
Requested change from UPS Broker to Minibroker within walkthrough.

Which issue(s) this PR fixes
Fixes #2658

Please leave this checklist in the PR comment so that maintainers can ensure a good PR.

Merge Checklist:

• New feature
  • Tests
  • Documentation
• SVCat CLI flag
• Server Flag for config
  • Chart changes
  • removing a flag by marking deprecated and hiding to avoid
    breaking the chart release and existing clients who provide a
    flag that will get an error when they try to update

[k8s-ci-robot]

Welcome @zulandar!

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[jberkhahn]

/assign @jberkhahn

[jberkhahn]

mentioned a couple things, other than that this looks good

[zulandar]

mentioned a couple things, other than that this looks good

Made the recommended adjustments.

[zulandar]

/retest

No code changes was performed to cause test failures. Here is the failure from the test.

Setting up ca-certificates (20161130+nmu1+deb9u1) ...
Updating certificates in /etc/ssl/certs...
/usr/sbin/update-ca-certificates: 101: /usr/sbin/update-ca-certificates: sed: Exec format error
/usr/sbin/update-ca-certificates: 75: /usr/sbin/update-ca-certificates: rm: Exec format error
dpkg: error processing package ca-certificates (--configure):
 subprocess installed post-installation script returned error exit status 2
Processing triggers for libc-bin (2.24-11+deb9u4) ...
Errors were encountered while processing:
 ca-certificates
�[91mE�[0m�[91m: Sub-process /usr/bin/dpkg returned an error code (1)
�[0mThe command '/bin/sh -c export DEBIAN_FRONTEND=noninteractive &&     apt-get update &&     apt-get install ca-certificates -y &&     rm -rf /var/lib/apt/lists/*' returned a non-zero code: 100
Makefile:383: recipe for target 'service-catalog-image' failed
make[1]: *** [service-catalog-image] Error 100
make[1]: Leaving directory '/home/prow/go/src/github.com/kubernetes-sigs/service-catalog'
Makefile:348: recipe for target 'arch-image-arm64' failed
make: *** [arch-image-arm64] Error 2
+ EXIT_VALUE=2
+ set +o xtrace

[mszostok]

/test pull-service-catalog-xbuild

[mszostok]

@zulandar currently is a known issue that the pull-service-catalog-xbuild is sometimes failing with such /usr/sbin/update-ca-certificates: rm: Exec format error error you need to add comment

/test pull-service-catalog-xbuild

to execute that test one more time.

[jberkhahn]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jberkhahn, zulandar

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