docs: Fix a few typos (#1679)

There are small typos in:
- docs/docs/exceptions.md
- docs/docs/jobs.md
- rq/queue.py
- tests/fixtures.py
- tests/test_job.py

Fixes:
- Should read `slightly` rather than `slighty`.
- Should read `requeuing` rather than `requeueing`.
- Should read `implementers` rather than `implementors`.
- Should read `definition` rather than `defition`.
- Should read `canceled` rather than `canceld`.

Signed-off-by: Tim Gates <tim.gates@iress.com>

docs/docs/exceptions.md

@@ -108,7 +108,7 @@ The handler can indicate this by returning a boolean. `False` means stop
 processing exceptions, `True` means continue and fall through to the next
 exception handler on the stack.
 
-It's important to know for implementors that, by default, when the handler
+It's important to know for implementers that, by default, when the handler
 doesn't have an explicit return value (thus `None`), this will be interpreted
 as `True` (i.e.  continue with the next handler).
 

docs/docs/jobs.md

@@ -319,7 +319,7 @@ job = queue.enqueue(foo_job, failure_ttl=300)  # 5 minutes in seconds
 ```
 
 
-### Requeueing Failed Jobs
+### Requeuing Failed Jobs
 
 If you need to manually requeue failed jobs, here's how to do it:
 
@@ -342,9 +342,9 @@ Starting from version 1.5.0, RQ also allows you to [automatically retry
 failed jobs](https://python-rq.org/docs/exceptions/#retrying-failed-jobs).
 
 
-### Requeueing Failed Jobs via CLI
+### Requeuing Failed Jobs via CLI
 
-RQ also provides a CLI tool that makes requeueing failed jobs easy.
+RQ also provides a CLI tool that makes requeuing failed jobs easy.
 
 ```console
 # This will requeue foo_job_id and bar_job_id from myqueue's failed job registry

rq/queue.py

@@ -734,7 +734,7 @@ nd
             return job, queue
         return None, None
 
-    # Total ordering defition (the rest of the required Python methods are
+    # Total ordering definition (the rest of the required Python methods are
     # auto-generated by the @total_ordering decorator)
     def __eq__(self, other):  # noqa
         if not isinstance(other, Queue):

tests/fixtures.py

@@ -1,6 +1,6 @@
 """
 This file contains all jobs that are used in tests.  Each of these test
-fixtures has a slighty different characteristics.
+fixtures has a slightly different characteristics.
 """
 
 import os

tests/test_job.py

@@ -820,7 +820,7 @@ class TestJob(RQTestCase):
         self.assertNotIn(job, registry)
 
     def test_create_and_cancel_job_fails_already_canceled(self):
-        """Ensure job.cancel() fails on already canceld job"""
+        """Ensure job.cancel() fails on already canceled job"""
         queue = Queue(connection=self.testconn)
         job = queue.enqueue(fixtures.say_hello, job_id='fake_job_id')
         self.assertEqual(1, len(queue.get_jobs()))