use -p option for mkdir command in example scripts

examples/example1_complete_report/createDocs.sh

@@ -1,4 +1,4 @@
-mkdir texdoclet_output
+mkdir -p texdoclet_output
 
 rm texdoclet_output/TeXDoclet.aux
 

examples/example2_complete_report/createDocs.sh

@@ -2,7 +2,7 @@
 # this example demonstrates the use of different .tex inlude files
 #
 
-mkdir texdoclet_output
+mkdir -p texdoclet_output
 
 rm texdoclet_output/TeXDoclet.aux
 

examples/example3_complete_article/createDocs.sh

@@ -1,4 +1,4 @@
-mkdir texdoclet_output
+mkdir -p texdoclet_output
 
 rm texdoclet_output/TeXDoclet.aux
 

examples/example4_include/createDocs.sh

@@ -4,7 +4,7 @@
 #   is included in another Latex document (MyDocument.tex) here
 #
 
-mkdir texdoclet_output
+mkdir -p texdoclet_output
 
 rm MyDocument.aux
 rm MyDocument.idx