Instance.md: Small corrections

src/docs/instances.md

@@ -192,7 +192,7 @@ Test cases based on a publicly available [unit commitment test case produced by
 
 ## 3. OR-LIB/UC
 
-[OR-LIB](http://people.brunel.ac.uk/~mastjjb/jeb/info.html) is a collection of test data sets for a variety of operations research problems, including unit commitment. The UC instances in OR-LIB are synthetic instances generated by [Antonio Frangioni's random UC generator](http://groups.di.unipi.it/optimize/Data/UC.html). These test cases have been used in [FrGe06] and many other publications.
+[OR-LIB](http://people.brunel.ac.uk/~mastjjb/jeb/info.html) is a collection of test data sets for a variety of operations research problems, including unit commitment. The UC instances in OR-LIB are synthetic instances generated by a [random problem generator](http://groups.di.unipi.it/optimize/Data/UC.html) developed by the [Operations Research Group at University of Pisa](http://groups.di.unipi.it/optimize/). These test cases have been used in [FrGe06] and many other publications.
 
 | Name | Hours | Buses | Generators | Lines | Contingencies | References |
 |------|-------|-------|------------|-------|---------------|------------|
@@ -241,7 +241,7 @@ Test cases based on a publicly available [unit commitment test case produced by
 
 ## 4. Tejada19
 
- Test cases used in [TeLuSa19]. These instances are similar to OR-LIB/UC, in the sense that they have also been generated using [Antonio Frangioni's random instance generator](http://groups.di.unipi.it/optimize/Data/UC.html), but are much larger.
+ Test cases used in [TeLuSa19]. These instances are similar to OR-LIB/UC, in the sense that they use the same random problem generator, but are much larger.
 
 | Name | Hours | Buses | Generators | Lines | Contingencies | References |
 |------|-------|-------|------------|-------|---------------|------------|