Update install-zowe-zos-convenience-build.md

[ArooshLele]

Describe your pull request here:
In the file, in step 2, a word was misspelt. So I corrected the spelling as follows:
I changed the spelling of sucessfully to successfully.

List the file(s) included in this PR:
install-zowe-zos-convenience-build.md

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[anaxceron]

looks good! thanks @ArooshLele!