doc: fix typo of GALLIUM_HUD_TOGGLE_SIGNAL

In the original commit message in 56a1c10 it was wrongly used too:
- env GALLIUM_HUD_SIGNAL_TOGGLE: toggle visibility via signal

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

diff --git a/docs/envvars.html b/docs/envvars.html
index 6d79398..789f5e9 100644 (file)
--- a/docs/envvars.html
+++ b/docs/envvars.html
@@ -215,7 +215,7 @@ Mesa EGL supports different sets of environment variables.  See the
 <li>GALLIUM_HUD_TOGGLE_SIGNAL - toggle visibility via user specified signal.
     Especially useful to toggle hud at specific points of application and
     disable for unencumbered viewing the rest of the time. For example, set
-    GALLIUM_HUD_VISIBLE to false and GALLIUM_HUD_SIGNAL_TOGGLE to 10 (SIGUSR1).
+    GALLIUM_HUD_VISIBLE to false and GALLIUM_HUD_TOGGLE_SIGNAL to 10 (SIGUSR1).
     Use kill -10 <pid> to toggle the hud as desired.
 <li>GALLIUM_LOG_FILE - specifies a file for logging all errors, warnings, etc.
     rather than stderr.