Omit comma when both verbs share a subject.

Co-authored-by: Chuck Toporek <chuck_toporek@apple.com>

Author: amartini51

Sources/TSPL/TSPL.docc/LanguageGuide/Generics.md

@@ -2,7 +2,7 @@
 
 # Generics
 
-Write code that works for multiple types, and specify requirements for those types.
+Write code that works for multiple types and specify requirements for those types.
 
 *Generic code* enables you to write flexible, reusable functions and types
 that can work with any type, subject to requirements that you define.

Sources/TSPL/TSPL.docc/LanguageGuide/TheBasics.md

@@ -2,7 +2,7 @@
 
 # The Basics
 
-Work with common kinds of data, and write basic syntax.
+Work with common kinds of data and write basic syntax.
 
 Swift is a programming language for iOS, macOS, watchOS, and tvOS app development.
 If you have experience developing in C or Objective-C,

Sources/TSPL/TSPL.docc/LanguageGuide/TypeCasting.md

@@ -2,7 +2,7 @@
 
 # Type Casting
 
-Determine a value's runtime type, and give it more specific type information.
+Determine a value's runtime type and give it more specific type information.
 
 *Type casting* is a way to check the type of an instance,
 or to treat that instance as a different

Sources/TSPL/TSPL.docc/ReferenceManual/Statements.md

@@ -2,7 +2,7 @@
 
 # Statements
 
-Structure groups of expressions, and control their behavior.
+Structure groups of expressions and control their behavior.
 
 In Swift, there are three kinds of statements: simple statements, compiler control statements,
 and control flow statements.