[GitHub] [spark] itholic opened a new pull request #32797: [SPARK-35603][R][DOCS] Add data source options link for R API documentation.

[GitBox]

itholic opened a new pull request #32797:
URL: https://github.com/apache/spark/pull/32797


   ### What changes were proposed in this pull request?
   
   There are options for data source are documented at Data Source Options page 
for every data sources.
   
   For Python, Scala, JAVA, the link for Data Source Option page was added in 
each API documentation.
   
   - Python
   <img width="732" alt="Screen Shot 2021-06-07 at 12 25 45 PM" 
src="https://user-images.githubusercontent.com/44108233/120955187-cbe38800-c78b-11eb-9475-ccf89bbc3c95.png";>
   
   - Scala
   <img width="677" alt="Screen Shot 2021-06-07 at 12 26 41 PM" 
src="https://user-images.githubusercontent.com/44108233/120955186-cab25b00-c78b-11eb-9fed-3f0d2024029b.png";>
   
   - JAVA
   <img width="726" alt="Screen Shot 2021-06-07 at 12 27 49 PM" 
src="https://user-images.githubusercontent.com/44108233/120955182-c8e89780-c78b-11eb-9cf1-13e41ba35b3e.png";>
   
   However, we have no link for R documentation, so we should add the link to 
the R documentation as well.
   
   
   ### Why are the changes needed?
   
   To provide users available options for each data source when they read/write 
it.
   
   
   ### Does this PR introduce _any_ user-facing change?
   
   Yes, the link for Data Source Option is added to R documentation as below.
   
   <img width="855" alt="Screen Shot 2021-06-07 at 12 29 26 PM" 
src="https://user-images.githubusercontent.com/44108233/120955302-064d2500-c78c-11eb-8dc3-cb22dfd5fd14.png";>
   
   
   ### How was this patch tested?
   
   Manually built doc and checked one by one


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