Merge pull request #210 from amomchilov/tweak-docs

[Docs] Add link and remove redundant doc line

Author: stephentyrone

Guides/AdjacentPairs.md

@@ -5,9 +5,6 @@
 
 Lazily iterates over tuples of adjacent elements.
 
-This operation is available for any sequence by calling the `adjacentPairs()`
-method.
-
 ```swift
 let numbers = (1...5)
 let pairs = numbers.adjacentPairs()

Guides/Combinations.md

@@ -86,7 +86,7 @@ call to `CombinationsSequence.Iterator.next()` is an O(_n_) operation.
 ### Naming
 
 The parameter label in `combination(ofCount:)` is the best match for the
-Swift API guidelines. A few other options were considered:
+[Swift's API Design Guidelines](https://www.swift.org/documentation/api-design-guidelines/). A few other options were considered:
 
 - When the standard library uses `of` as a label, the parameter is generally 
   the object of the operation, as in `type(of:)` and `firstIndex(of:)`, and