Removed obsolete methods from rst file (rapidsai#4331)

Removes doc generation for the link prediction algorithm methods that have been taken out
closes rapidsai#4330

Authors:
  - Don Acosta (https://github.com/acostadon)
  - Alex Barghi (https://github.com/alexbarghi-nv)

Approvers:
  - Brad Rees (https://github.com/BradReesWork)

URL: rapidsai#4331

docs/cugraph/source/api_docs/cugraph/link_prediction.rst

@@ -11,7 +11,6 @@ Jaccard Coefficient
 
    cugraph.jaccard
    cugraph.jaccard_coefficient
-   cugraph.jaccard_w
 
 
 Overlap Coefficient
@@ -21,7 +20,6 @@ Overlap Coefficient
 
    cugraph.overlap
    cugraph.overlap_coefficient
-   cugraph.overlap_w
 
 
 Sorensen Coefficient
@@ -31,4 +29,3 @@ Sorensen Coefficient
 
    cugraph.sorensen
    cugraph.sorensen_coefficient
-   cugraph.sorensen_w