RFR: 8219567: Name of first parameter of RandomAccessFile(String,String) is inconsistent

[Brian Burkhalter]

Revise some verbiage about the `RandomAccessFile(String,String)` constructor so that the string name of a file is referred to as _pathname string_ for consistency with `java.io.File`.

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Commit messages:
 - 8219567: Name of first parameter of RandomAccessFile(String,String) is inconsistent

Changes: https://git.openjdk.org/jdk/pull/15351/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15351&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8219567
  Stats: 13 lines in 1 file changed: 0 ins; 0 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/15351.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15351/head:pull/15351

PR: https://git.openjdk.org/jdk/pull/15351