add links to dim-reduction pattern; correct "ensembling" tag

Author: ablaom

docs/src/common_implementation_patterns.md

@@ -27,11 +27,11 @@ implementations fall into one (or more) of the following informally understood p
 
 - [Feature Engineering](@ref): Algorithms for selecting or combining features
 
-- Dimension Reduction: Transformers that learn to reduce feature space dimension
+- [Dimension Reduction](@ref): Transformers that learn to reduce feature space dimension
 
 - Missing Value Imputation
 
-- Transformers: Other transformers, such as standardizers, and categorical
+- [Transformers](@ref): Other transformers, such as standardizers, and categorical
   encoders.
 
 - [Static Algorithms](@ref): Algorithms that do not learn, in the sense they must be

docs/src/patterns/dimension_reduction.md

@@ -1 +1,7 @@
 # Dimension Reduction
+
+Check out the following examples:
+
+- [Truncated
+  SVD]((https://github.com/JuliaAI/LearnTestAPI.jl/blob/dev/test/patterns/dimension_reduction.jl
+  (from the TestLearnAPI.jl test suite)

docs/src/patterns/transformers.md

@@ -1 +1,7 @@
 # Transformers
+
+Check out the following examples:
+
+- [Truncated
+  SVD]((https://github.com/JuliaAI/LearnTestAPI.jl/blob/dev/test/patterns/dimension_reduction.jl
+  (from the TestLearnAPI.jl test suite)

src/traits.jl

@@ -176,7 +176,7 @@ tags() = [
     "missing value imputation",
     "transformers",
     "static algorithms",
-    "ensemble algorithms",
+    "ensembling",
     "time series forecasting",
     "time series classification",
     "survival analysis",