[twenty-years] Fix missing closing delimiters

[Federico Mena Quintero <federico src gnome org>]

commit 0c2941eeb4fadb6ef44a329f0b4c25d731dd4722
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue Apr 28 20:48:19 2020 -0500

    Fix missing closing delimiters

 book/graphics.tex  | 2 +-
 book/languages.tex | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/book/graphics.tex b/book/graphics.tex
index d7a5f42..8827920 100644
--- a/book/graphics.tex
+++ b/book/graphics.tex
@@ -44,7 +44,7 @@ program.
 Imlib was the library that the Enlightenment window manager used to
 load raster image files.  It had been written exactly to do that, and
 the API reflected it.\footnote{The Imlib source code is still
-  available at \url{https://git.gnome.org/browse/archive/imlib/}
+  available at \url{https://git.gnome.org/browse/archive/imlib/}}
 
 Imlib had an API that was good for Enlightenment, but not very
 convenient for a general-purpose image loader.  You could specify a
diff --git a/book/languages.tex b/book/languages.tex
index 523e29d..7a6a55e 100644
--- a/book/languages.tex
+++ b/book/languages.tex
@@ -39,7 +39,7 @@ functions.
 Before GTK+ had reference counting, code looked more or less like
 this:
 
-\begin{lstlisting}[basicstyle=\footnotesize,
+\begin{lstlisting}[basicstyle=\footnotesize]
     GtkWidget *window;
     GtkWidget *box;
     GtkWidget *menubar;
@@ -75,7 +75,7 @@ collectors to work on top of GTK+'s simple reference counting.
 Now, in a purely reference-counted scheme of things, the code would
 have to look something like this:
 
-\begin{lstlisting}[basicstyle=\footnotesize,
+\begin{lstlisting}[basicstyle=\footnotesize]
     GtkWidget *window;
     GtkWidget *box;
     GtkWidget *menubar;