storm-core: fix 'seperate' -> 'separate' in configuration.h comment

Single-word spelling correction in a comment in
storm-core/src/native/worker-launcher/impl/configuration.h.

No functional changes.

Signed-off-by: Sai Asish Y <say.apm35@gmail.com>

Author: SAY-5

storm-core/src/native/worker-launcher/impl/configuration.h

@@ -31,7 +31,7 @@ void read_config(const char* config_file);
 char *get_value(const char* key);
 
 //function to return array of values pointing to the key. Values are
-//comma seperated strings.
+//comma separated strings.
 char ** get_values(const char* key);
 
 /**