[FLINK-13637][docs] Fix problems of anchors in document(building.md, common.md, queryable_state.md)

[hequn8128]

What is the purpose of the change

This pull request fixes problems of anchors in documents(building.md, common.md, queryable_state.md).

The format should be:
[create an anchor](#anchors-in-markdown)

• Add - characters between each word in the heading and wrap the value in parens
• All letters should be lowercase.

Brief change log

• Change letters to lowercase in queryable_state.md and common.md.
• Add - characters between each word for the anchors in building.md.

Verifying this change

This change is a trivial rework / code cleanup without any test coverage.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? (no)

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Automated Checks

Last check on commit 5aa026a (Fri Aug 23 10:15:33 UTC 2019)

✅no warnings

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Review Progress

• ✅ 1. The [description] looks good.
  • Approved by @hequn8128
• ✅ 2. There is [consensus] that the contribution should go into to Flink.
  • Approved by @hequn8128
• ❓ 3. Needs [attention] from.
• ✅ 4. The change fits into the overall [architecture].
  • Approved by @hequn8128
• ✅ 5. Overall code [quality] is good.
  • Approved by @hequn8128

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CI report:

• 5aa026a : SUCCESS Build

[dianfu]

Good catch! +1

[hequn8128]

@dianfu Thank you. I'll merge this...
@flinkbot approve all