JDK-8294536: Update troff form of man page for new --spec-base-url option

[jonathan-gibbons]

Please review a trivial change to update the open form of the javadoc man page.

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Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8294536: Update troff form of man page for new --spec-base-url option

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk pull/10838/head:pull/10838
$ git checkout pull/10838

Update a local copy of the PR:
$ git checkout pull/10838
$ git pull https://git.openjdk.org/jdk pull/10838/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 10838

View PR using the GUI difftool:
$ git pr show -t 10838

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/10838.diff

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[mlbridge]

Webrevs

• 00: Full (345b1cb5)

[jonathan-gibbons]

Please see #10972 instead.