[Mrql Wiki] Update of "LanguageDescription" by LeonidasFegaras

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The "LanguageDescription" page has been changed by LeonidasFegaras:
https://wiki.apache.org/mrql/LanguageDescription?action=diff&rev1=3&rev2=4

  evaluate MRQL queries in BSP mode, you must run the script {{{bin/mrql.bsp}}}. To
  evaluate MRQL queries in Spark mode, you must run the script {{{bin/mrql.spark}}}.
  First, you need to change the first lines of {{{conf/mrql-env.sh}}}
- to point to your directories and configuration
+ to point to your installation directories.
- files. The directory {{{tests/queries}}} contains various MRQL example
+ The directory {{{tests/queries}}} contains various MRQL example
  queries over small data sets.
  
  == Evaluating MRQL Queries in MapReduce Mode ==
@@ -124, +124 @@

   * {{{-bag_print n}}}:  the maximum number of collection elements to print (default is 20). 
  	
   * {{{-split_size}}}:  the number of elements per mapper to process the range min...max (default is 100000).
+ 
+  * {{{-info}}}:  displays all the INFO log messages during evaluation.
  
   * {{{-NC}}}:  do not compile the functional arguments to Java bytecode at run-time (the default is to compile). Compilation speeds up execution but slows down setup time.