Corrected some titles to use title case (#563)

Author: julian-cable

en-US/Punctuation.xml

@@ -14,7 +14,7 @@
 			Current standards allow the use of a colon or semicolon in a range of different circumstances. Some of these are described in the following sections.
 		</para>
 		 <formalpara>
-			<title> To relate clauses:</title>
+			<title> To Relate Clauses</title>
 			 <para>
 				The following sentences show a connection or shared theme between two clauses, or use the second clause to reiterate or amplify the idea in the first clause:
 			</para>
@@ -54,7 +54,7 @@
 			Try to limit your use of colons and semicolons. Separate sentences with a period if possible.
 		</para>
 		 <formalpara>
-			<title>To introduce a series:</title>
+			<title>To Introduce a Series</title>
 			 <para>
 				A colon is generally used before a series.
 			</para>
@@ -142,7 +142,7 @@
 		</itemizedlist>
 
 		 <formalpara id="list-intro-punc">
-			<title>To introduce a list, command, code block, or procedure</title>
+			<title>To Introduce a List, Command, Code Block, or Procedure</title>
 			 <para>
 				If a list, command, code block, or procedure immediately follows a single stem or introductory sentence, then end that sentence with a colon.
 			</para>
@@ -265,7 +265,7 @@ PLAY [Gather and display facts for managed nodes] ****************************</
 	 <section id="commas">
 		<title>Commas</title>
 		 <formalpara id="compound-sentences">
-			<title>In compound sentences:</title>
+			<title>In Compound Sentences</title>
 			 <para>
 				Use a comma to join clauses in a compound sentence, unless the clauses are short and have a similar theme.
 			</para>
@@ -320,7 +320,7 @@ PLAY [Gather and display facts for managed nodes] ****************************</
 
 		</itemizedlist>
 		 <formalpara id="conjunctive-adverbs">
-			<title>With conjunctive adverbs:</title>
+			<title>With Conjunctive Adverbs</title>
 			 <para>
 				When using a conjunctive adverb (such as <emphasis>however, therefore, otherwise, namely, for example</emphasis>, and so on) in a sentence, set it off with commas.
 			</para>
@@ -342,7 +342,7 @@ PLAY [Gather and display facts for managed nodes] ****************************</
 
 		</itemizedlist>
 		 <formalpara id="adverbial-clauses">
-			<title>In adverbial clauses and phrases:</title>
+			<title>In Adverbial Clauses and Phrases</title>
 			 <para>
 				If a dependent clause is restrictive (omission affects the meaning of the main clause), do not set it off with commas. If it is nonrestrictive (omission does not affect the main clause), set it off with commas:
 			</para>
@@ -382,7 +382,7 @@ PLAY [Gather and display facts for managed nodes] ****************************</
 
 		</itemizedlist>
 		 <formalpara id="adjectival-clauses">
-			<title>In adjectival clauses or phrases:</title>
+			<title>In Adjectival Clauses or Phrases</title>
 			 <para>
 				An adjectival clause that can be dropped without changing the meaning of the sentence is set off with commas.
 			</para>
@@ -410,7 +410,7 @@ PLAY [Gather and display facts for managed nodes] ****************************</
 
 		</itemizedlist>
 		 <formalpara id="coordinate-adjectives">
-			<title>With coordinate adjectives:</title>
+			<title>With Coordinate Adjectives</title>
 			 <para>
 				Separate coordinate adjectives (two or more adjectives modifying the same noun) with commas.
 			</para>
@@ -432,7 +432,7 @@ PLAY [Gather and display facts for managed nodes] ****************************</
 
 		</itemizedlist>
 		 <formalpara id="series-lists">
-			<title>With series and lists:</title>
+			<title>With Series and Lists</title>
 			 <para>
 				Separate elements in a series of three or more with commas, including a comma before the conjunction if one is used.
 			</para>