Fix some typos in comments (found by codespell) (#1331)

Fix also a grammar issue.
Signed-off-by: NStefan Weil <sw@weilnetz.de>

api/renderer.h

@@ -108,7 +108,7 @@ class TESS_API TessResultRenderer {
     // Hook for specialized handling in BeginDocument()
     virtual bool BeginDocumentHandler();
 
-    // This must be overriden to render the OCR'd results
+    // This must be overridden to render the OCR'd results
     virtual bool AddImageHandler(TessBaseAPI* api) = 0;
 
     // Hook for specialized handling in EndDocument()

configure.ac

@@ -276,7 +276,7 @@ AC_ARG_ENABLE([tessdata-prefix],
 AC_MSG_RESULT([$tessdata_prefix])
 AM_CONDITIONAL([NO_TESSDATA_PREFIX], [test "$tessdata_prefix" = "no"])
 
-# Check whether enable debuging
+# Check whether to enable debugging
 AC_MSG_CHECKING([whether to enable debugging])
 AC_ARG_ENABLE([debug],
     [AS_HELP_STRING([--enable-debug],