fix typo in extension EGL_EXT_config_select_group (#172)

Signed-off-by: David Heidelberg <david.heidelberg@collabora.com>

Signed-off-by: David Heidelberg <david.heidelberg@collabora.com>
diff --git a/extensions/EXT/EGL_EXT_config_select_group.txt b/extensions/EXT/EGL_EXT_config_select_group.txt
index 9721195..0da3dc5 100644
--- a/extensions/EXT/EGL_EXT_config_select_group.txt
+++ b/extensions/EXT/EGL_EXT_config_select_group.txt
@@ -79,7 +79,7 @@
     override the default sorting rules, by collecting configurations into
     groups. It is not accepted by the <attrib_list> parameter of
     eglChooseConfig, but it is accepted as the <attribute> in
-    eglGetConfigAtrrib."
+    eglGetConfigAttrib."
 
     In section 3.4 "Configuration Management", under the "Sorting of EGLConfigs"
     heading, append to table 3.4 the following: