[readme] fix typos in READMEs

[nandajavarma]

Description

Fixes some typos and wrong wordings in main and installer READMEs

Related Issue(s)

NA

How to test

NA

Release Notes

NONE

Documentation

No

[codecov]

Codecov Report

Merging #8642 (9d74f32) into main (840d29a) will increase coverage by 3.01%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            main    #8642      +/-   ##
=========================================
+ Coverage   8.15%   11.17%   +3.01%     
=========================================
  Files         34       18      -16     
  Lines       2402      993    -1409     
=========================================
- Hits         196      111      -85     
+ Misses      2201      880    -1321     
+ Partials       5        2       -3     

Flag	Coverage Δ
components-gitpod-cli-app	11.17% <ø> (ø)
components-local-app-app-darwin-amd64	?
components-local-app-app-darwin-arm64	?
components-local-app-app-linux-amd64	?
components-local-app-app-linux-arm64	?
components-local-app-app-windows-386	?
components-local-app-app-windows-amd64	?
components-local-app-app-windows-arm64	?
install-installer-raw-app	?

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Impacted Files	Coverage Δ
...installer/pkg/components/ws-manager/rolebinding.go
install/installer/pkg/common/networkpolicies.go
install/installer/pkg/common/display.go
install/installer/pkg/common/ca.go
install/installer/pkg/common/common.go
install/installer/pkg/common/storage.go
...l/installer/pkg/components/ws-manager/tlssecret.go
components/local-app/pkg/auth/pkce.go
install/installer/pkg/common/objects.go
components/local-app/pkg/auth/auth.go
... and 6 more

---

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[mrsimonemms]

Welcome to Gitpod

[mrsimonemms]

/lgtm