Update tutorials/3d/environment_and_post_processing.rst

Co-authored-by: tetrapod <[email protected]>

Author: allenwp

tutorials/3d/environment_and_post_processing.rst

@@ -346,7 +346,7 @@ The tone mapping options are:
   - **AgX:** Uses a film-like tonemapping curve and desaturates bright values
     for a more realistic appearance. Better than other tonemappers at
     maintaining the hue of colors as they become brighter. The slowest
-    tonemapping option. *Note:* **White** is fixed at a value of ``16.29``,
+    tonemapping option. **White** is fixed at a value of ``16.29``,
     which makes AgX unsuitable for use with the Mobile rendering method.
 
 - **Exposure:** Adjusts the brightness of values before they are provided to