Get rid of dumb sex joke (#840)

These kinds of jokes make us look bad, and have gotten this project bad
PR on social media. It's best to get rid of them. We can still be super
glib and funny without crass jokes.

docs/usage.md

@@ -119,10 +119,10 @@ Will print all entries in which either `@pinkie` or `@WorldDomination`
 occurred.
 
 ```sh
-jrnl -n 5 -and @pineapple @lubricant
+jrnl -n 5 -and @pinkie @WorldDomination
 ```
 
-the last five entries containing both `@pineapple` **and** `@lubricant`.
+the last five entries containing both `@pinkie` **and** `@worldDomination`.
 You can change which symbols you'd like to use for tagging in the
 configuration.
 
@@ -154,7 +154,7 @@ encrypt) your edited journal after you save and exit the editor.
 You can also use this feature for deleting entries from your journal
 
 ```sh
-jrnl @girlfriend -until 'june 2012' --edit
+jrnl @texas -until 'june 2012' --edit
 ```
 
 Just select all text, press delete, and everything is gone...