Fix names on sentinels to get doxygen to shaddap.

indra/llrender/llglcommonfunc.h

 /**
-* @file llphoenixfunc.h
+* @file llglcommonfunc.h
 * @brief File include common opengl code snippets
 *
 * $LicenseInfo:firstyear=2003&license=viewerlgpl$

indra/llrender/llgltexture.h

 /** 
- * @file llglviewertexture.h
+ * @file llgltexture.h
  * @brief Object for managing opengl textures
  *
  * $LicenseInfo:firstyear=2012&license=viewerlgpl$