Copybara import of the project:

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4883e8aacd531d8dbc3551ba7cb4e3b4694dda1e by Silvio Traversaro <silvio@traversaro.it>:

Fix plugin related comment in simulate

The comment was outdated after https://github.com/google-deepmind/mujoco/commit/2ebc5f097b1a5fbbe276250ad1d13966510d1291 .

COPYBARA_INTEGRATE_REVIEW=https://github.com/google-deepmind/mujoco/pull/1499 from traversaro:patch-37 4883e8aacd531d8dbc3551ba7cb4e3b4694dda1e
PiperOrigin-RevId: 615005350
Change-Id: I93d746f996de25b871cc1bc5651308d44382feef

simulate/main.cc

@@ -180,8 +180,9 @@ void scanPluginLibraries() {
 #endif
 
 
-  // try to open the ${EXECDIR}/plugin directory
+  // try to open the ${EXECDIR}/MUJOCO_PLUGIN_DIR directory
   // ${EXECDIR} is the directory containing the simulate binary itself
+  // MUJOCO_PLUGIN_DIR is the MUJOCO_PLUGIN_DIR preprocessor macro
   const std::string executable_dir = getExecutableDir();
   if (executable_dir.empty()) {
     return;