Find a typo in the installplan error message

[horis233]

Bug Report

What did you do?
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When the operator upgrade failed because of the CRD doesn't backward compatible with the existing CR, the install plan will show

error validating existing CRs agains new CRD's schema:

What did you expect to see?

I think the error message should be

error validating existing CRs against new CRD's schema:

A clear and concise description of what you expected to happen (or insert a code snippet).

What did you see instead? Under which circumstances?
A clear and concise description of what you expected to happen (or insert a code snippet).

Environment

• operator-lifecycle-manager version:
  4.5.4

• Kubernetes version information:

Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.3", GitCommit:"2e7996e3e2712684bc73f0dec0200d64eec7fe40", GitTreeState:"clean", BuildDate:"2020-05-20T12:52:00Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"18+", GitVersion:"v1.18.3+012b3ec", GitCommit:"012b3ec", GitTreeState:"clean", BuildDate:"2020-07-24T07:23:10Z", GoVersion:"go1.13.4", Compiler:"gc", Platform:"linux/amd64"}

• Kubernetes cluster kind:

OCP

Possible Solution

I will open a PR for this tiny issue

Additional context
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