Fix minor issues in README file

[carolinebriaud]

Signed-off-by: Caroline Briaud caroline.briaud@docker.com

- What I did
Fix minor issues in README after latest update

- How to verify it
Read the README

- A picture of a cute animal (not mandatory)

[silvin-lubecki]

LGTM

[codecov]

Codecov Report

Merging #744 into master will decrease coverage by 1.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #744      +/-   ##
==========================================
- Coverage      70%   68.93%   -1.07%     
==========================================
  Files          64       64              
  Lines        3600     3432     -168     
==========================================
- Hits         2520     2366     -154     
+ Misses        757      748       -9     
+ Partials      323      318       -5

Impacted Files	Coverage Δ
internal/store/bundle.go	75.66% <0%> (-8.25%)	⬇️
internal/packager/init.go	63.26% <0%> (-6.84%)	⬇️
internal/commands/build/types.go	69.23% <0%> (-1.1%)	⬇️

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