Incorrect grammar and unclear wording in RandomStringUtils#random method

[IcoreE]

Incorrect grammar and unclear wording in RandomStringUtils#random method

public static String random(int count, int start, int end, final boolean letters, final boolean numbers,
            final char[] chars, final Random random) 

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[garydgregory]

Jira https://issues.apache.org/jira/browse/LANG-1800

[garydgregory]

@IcoreE
I merged the PR. Thank you!