docs: Apply missed upstream Java docs formatting fix from PR #80

[promptless]

After reviewing the complete list of 19 upstream commits in PR #80's compare view (not just the 10 shown in the PR description), I identified one documentation fix that should be applied to our fork:

Java toolchain formatting fix (commit e23f78f): Improves the bullet list formatting in the "Configuring the Java toolchains" section of docs/bazel-and-java.mdx. Changes include using * instead of - for bullets, adding proper spacing, and adding "the" before flag names for better readability.

Note: I also discovered that external/extension.mdx is completely missing from our fork (listed in copy-upstream-docs.sh but not present). This is a significant documentation gap for module extensions, but it's a pre-existing issue not introduced by PR #80. This warrants a separate investigation/suggestion.

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[promptless]

I've added the requested changes in commit 5764bfd

[alan707]

LGTM

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[alan707]

@Promptless please create a PR to address this:

Note: I also discovered that external/extension.mdx is completely missing from our fork (listed in copy-upstream-docs.sh but not present). This is a significant documentation gap for module extensions, but it's a pre-existing issue not introduced by PR https://github.com/alan707/bazel-docs/pull/80. This warrants a separate investigation/suggestion.