tracing: Fix doc mistakes in trace sample

The trace sample file has a couple mispellings, lets fix them.
Signed-off-by: NJeremy Linton <jeremy.linton@arm.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

samples/trace_events/trace-events-sample.h

@@ -95,7 +95,7 @@
  *         __entry->bar.x = y;
 
  *   __array: There are three fields (type, name, size). The type is the
- *         type of elements in teh array, the name is the name of the array.
+ *         type of elements in the array, the name is the name of the array.
  *         size is the number of items in the array (not the total size).
  *
  *         __array( char, foo, 10) is the same as saying: char foo[10];
@@ -112,7 +112,7 @@
  *         type is the type of the element, name is the name of the array.
  *         The size is different than __array. It is not a static number,
  *         but the algorithm to figure out the length of the array for the
- *         specific instance of tracepoint. Again, size is the numebr of
+ *         specific instance of tracepoint. Again, size is the number of
  *         items in the array, not the total length in bytes.
  *
  *         __dynamic_array( int, foo, bar) is similar to: int foo[bar];
@@ -125,9 +125,9 @@
  *         Notice, that "__entry" is not needed here.
  *
  *   __string: This is a special kind of __dynamic_array. It expects to
- *         have a nul terminated character array passed to it (it allows
+ *         have a null terminated character array passed to it (it allows
  *         for NULL too, which would be converted into "(null)"). __string
- *         takes two paramenter (name, src), where name is the name of
+ *         takes two parameter (name, src), where name is the name of
  *         the string saved, and src is the string to copy into the
  *         ring buffer.
  *
@@ -444,7 +444,7 @@ DECLARE_EVENT_CLASS(foo_template,
 
 /*
  * Here's a better way for the previous samples (except, the first
- * exmaple had more fields and could not be used here).
+ * example had more fields and could not be used here).
  */
 DEFINE_EVENT(foo_template, foo_with_template_simple,
 	TP_PROTO(const char *foo, int bar),