Add an example of creating a line break by adding two spaces at

the end of a line.

doc/markdown/markdown.md

@@ -485,6 +485,10 @@ This line is separated from the one above by two newlines, so it will be a *sepa
 
 This line is also a separate paragraph, but...
 This line is only separated by a single newline, so it's a separate line in the *same paragraph*.
+
+This line is also a separate paragraph, and...  
+This line is on its own line, because the previous line ends with two
+spaces.
 ```
 
 Here's a line for us to start with.
@@ -494,6 +498,10 @@ This line is separated from the one above by two newlines, so it will be a *sepa
 This line is also begins a separate paragraph, but...
 This line is only separated by a single newline, so it's a separate line in the *same paragraph*.
 
+This line is also a separate paragraph, and...  
+This line is on its own line, because the previous line ends with two
+spaces.
+
 ## Tables
 
 Tables aren't part of the core Markdown spec, but they are part of GFM and Markdown Here supports them.