Fix typo and clarify

examples/cdindex/README.md

@@ -1,12 +1,12 @@
 # Calculate the CD5 index of Crossref works
 
-A publication's [CD index](https://doi.org/10.1287/mnsc.2015.2366)
+A publication's [consolidation-disruption (CD) index](https://doi.org/10.1287/mnsc.2015.2366)
 provides a dynamic network measure of scientific progress.
 The scripts in this directory calculate the CD₅ (five-year) index
 for Crossref works published between 1945 and 2021.
 To do so it populates a graph with 116,568,934 nodes (publications) and
 1,255,033,889 edges (citations).
-The C++ implementation used ([cdindex-db.cpp](./cdindex-db.cpp)
+The C++ implementation used ([cdindex-db.cpp](./cdindex-db.cpp))
 is multithreaded, so on an 8-core machine it takes less than 10 hours.
 It also demonstrates using an Alexandria3k populated database with C++.