Improve the first sentences of the three `FileInputStream` constructors, in particular removing the term "connection."
------------- Commit messages: - 8340229: Improve opening sentence of FileInputStream constructor specification Changes: https://git.openjdk.org/jdk/pull/21223/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21223&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8340229 Stats: 11 lines in 1 file changed: 0 ins; 4 del; 7 mod Patch: https://git.openjdk.org/jdk/pull/21223.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/21223/head:pull/21223 PR: https://git.openjdk.org/jdk/pull/21223
