Fix various spelling mistakes made in values.yaml & README.md.

[mcdonagj]

These changes fix various spelling mistakes made in the project's values.yaml & README.md.

• In charts/vsphere-cpi/values.yaml, overriden has been corrected to overridden.
• In charts/vsphere-csi-old/README.md, multple has been corrected to multiple.
• In charts/vsphere-csi/README.md, several changes has been changed:
  • Configre has been corrected to Configure.
  • overriden has been corrected to overridden.
  • specifc confguration has been corrected to specific configuration.
• In charts/vsphere-csi/values.yaml, several changes has been changed:
  • overriden has been corrected to overridden.
  • specifc confguration has been corrected to specific configuration.

[mcdonagj]

@MaxRink, sorry to tag you directly, but can I get reviewers added for these changes?

I don't think I have permission to do it myself. :(