Swift: Fix more underline length issues.

Author: geoffw0

docs/codeql/codeql-language-guides/analyzing-data-flow-in-swift.rst

@@ -212,7 +212,7 @@ The global taint tracking library uses the same configuration module as the glob
    select source, "Taint flow to $@.", sink, sink.toString()
 
 Predefined sources
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~
 
 The data flow library module ``codeql.swift.dataflow.FlowSources`` contains a number of predefined sources, providing a good starting point for defining data flow and taint flow based security queries.
 

docs/codeql/codeql-language-guides/codeql-for-swift.rst

@@ -1,7 +1,7 @@
 .. _codeql-for-swift:
 
 CodeQL for Swift
-===============
+================
 
 Experiment and learn how to write effective and efficient queries for CodeQL databases generated from Swift codebases.