Fix two typos in comments

Signed-off-by: Stefan Weil <sw@weilnetz.de>

ccstruct/rejctmap.cpp

@@ -267,7 +267,7 @@ void REJ::full_print(FILE *fp) {
 
 //The REJMAP class has been hacked to use alloc_struct instead of new [].
 //This is to reduce memory fragmentation only as it is rather kludgy.
-//alloc_struct by-passes the call to the contsructor of REJ on each
+//alloc_struct by-passes the call to the constructor of REJ on each
 //array element. Although the constructor is empty, the BITS16 members
 //do have a constructor which sets all the flags to 0. The memset
 //replaces this functionality.

neural_networks/runtime/input_file_buffer.cpp

@@ -18,7 +18,7 @@
 #include "input_file_buffer.h"
 
 namespace tesseract {
-// default and only contsructor
+// default and only constructor
 InputFileBuffer::InputFileBuffer(const string &file_name)
   : file_name_(file_name) {
   fp_ = NULL;