[SPARK-48240][DOCS] Replace Local[..] with "Local[...]" in the docs

[panbingkun]

What changes were proposed in this pull request?

The pr aims to replace Local[..] with "Local[...]" in the docs

Why are the changes needed?

1.When I recently switched from bash to zsh and executed command ./bin/spark-shell --master local[8] on local, the following error will be printed:

2.Some descriptions in the existing documents have been written as --master "local[n]", eg:

spark/docs/index.md

Line 49 in f699f55

./bin/pyspark --master "local[2]"

3.The root cause is: https://blog.peiyingchi.com/2017/03/20/spark-zsh-no-matches-found-local/

Does this PR introduce any user-facing change?

Yes, with the zsh becoming the mainstream of shell, avoid the confusion of spark users when submitting apps with ./bin/spark-shell --master "local[n]" ... or ./bin/spark-sql --master "local[n]" ..., etc

How was this patch tested?

Manually test
Whether the user uses bash or zsh, the above --master "local[n]" can be executed successfully in the expected way.

Was this patch authored or co-authored using generative AI tooling?

No.

[panbingkun]

cc @zhengruifeng @dongjoon-hyun @HyukjinKwon

[HyukjinKwon]

Merged to master.