Remove trailing spaces and extra blank lines

Author: owen-mc

docs/query-help-style-guide.md

@@ -16,7 +16,7 @@ When you contribute a new [supported query](supported-queries.md) to this reposi
 
 ### Location and file name
 
-Query help files must have the same base name as the query they describe and must be located in the same directory.  
+Query help files must have the same base name as the query they describe and must be located in the same directory.
 
 ### File structure and layout
 
@@ -42,7 +42,6 @@ Section-level elements are used to group the information within the query help f
 
 For further information about the other section-level, block, list and table elements supported by query help files, see [Query help files](https://codeql.github.com/docs/writing-codeql-queries/query-help-files/) on codeql.github.com.
 
-
 ## English style
 
 You should write the overview and recommendation elements in simple English that is easy to follow. You should:
@@ -98,7 +97,6 @@ If you are citing an academic paper, we recommend adopting the reference style o
 
 >S. R. Chidamber and C. F. Kemerer, _A metrics suite for object-oriented design_. IEEE Transactions on Software Engineering, 20(6):476-493, 1994.
 
-
 ### Websites
 
 If you are citing a website, please use the following format, without breadcrumb trails:
@@ -154,13 +152,13 @@ later. For example, it's easy to see at a glance which part of the code is in th
 scope of an <code>if</code> statement, and adding more statements to the body of the <code>if</code>
 statement is less error-prone.</p>
 
-<p>You should also ensure that the indentation of the code is consistent with the actual flow of 
+<p>You should also ensure that the indentation of the code is consistent with the actual flow of
 control, so that it does not confuse programmers.</p>
 
 </recommendation>
 <example>
 
-<p>In the example below, the original version of <code>Cart</code> is missing braces. This means 
+<p>In the example below, the original version of <code>Cart</code> is missing braces. This means
 that the code triggers a <code>NullPointerException</code> at runtime if <code>i</code>
 is <code>null</code>.</p>