[MINOR][DOC] revisions for spark sql performance tuning to improve readability and grammar
[MINOR][DOC] revisions for spark sql performance tuning to improve readability and grammar

### What changes were proposed in this pull request?

I made some small grammar fixes related to dependent clause followed but independent clauses, starting a sentence with an introductory phrase, using the plural with when are is present in the sentence, and other small fixes to improve readability.

https://spark.apache.org/docs/latest/sql-performance-tuning.html

<img width="1065" alt="Screenshot 2022-11-04 at 15 24 17" src="https://user-images.githubusercontent.com/7563201/199998862-d9418bc1-2fcd-4eff-be8e-af412add6946.png">

### Why are the changes needed?

These changes improve the readability of the Spark documentation for new users or those studying up.

### Does this PR introduce _any_ user-facing change?

Yes, these changes impact the spark documentation.

### How was this patch tested?

No test were created as these changes were solely in markdown.

Closes #38510 from dwsmith1983/minor-doc-revisions.

Lead-authored-by: Dustin William Smith <1538c011aeea90c623ef5dc0a0c049d8b0a41c8d@deliveryhero.com>
Co-authored-by: dustin <3f465b7a45446306c2e459ab16945c1e220872c0@users.noreply.github.com>
Co-authored-by: Dustin Smith <22bf039024662521529033ff6580f93f3a6ee38c@gmail.com>
Signed-off-by: Sean Owen <d519fa33a62684a61ab04b24d26f83452d51b34c@gmail.com>

dongjoon-hyun/spark,ueshin/apache-spark,hvanhovell/spark,mahak/spark,wangyum/spark,HyukjinKwon/spark,mahak/spark,srowen/spark,ueshin/apache-spark,apache/spark,HyukjinKwon/spark,hvanhovell/spark,hvanhovell/spark,wangyum/spark,HyukjinKwon/spark,dongjoon-hyun/spark,zzcclp/spark,vinodkc/spark,zzcclp/spark,zzcclp/spark,mahak/spark,zzcclp/spark,ueshin/apache-spark,mahak/spark,zzcclp/spark,vinodkc/spark,apache/spark,zzcclp/spark,srowen/spark,dongjoon-hyun/spark,dongjoon-hyun/spark,ueshin/apache-spark,wangyum/spark,HyukjinKwon/spark,vinodkc/spark,srowen/spark,vinodkc/spark,mahak/spark,wangyum/spark,vinodkc/spark,apache/spark,vinodkc/spark,zzcclp/spark,HyukjinKwon/spark,apache/spark,hvanhovell/spark,srowen/spark,dongjoon-hyun/spark,ueshin/apache-spark,vinodkc/spark,apache/spark,srowen/spark,mahak/spark,apache/spark,HyukjinKwon/spark,apache/spark,srowen/spark,dongjoon-hyun/spark,HyukjinKwon/spark,wangyum/spark,ueshin/apache-spark,hvanhovell/spark,wangyum/spark,srowen/spark,hvanhovell/spark,ueshin/apache-spark,wangyum/spark,mahak/spark,dongjoon-hyun/spark,hvanhovell/spark