Fix several typos and spelling errors (#871)

Discovered using codespell:
https://github.com/codespell-project/codespell

CHANGELOG.md

@@ -54,7 +54,7 @@
 
 ### Added
 
-- Tesed on ruby 3.0 and 3.1
+- Tested on ruby 3.0 and 3.1
 
 ### Fixed
 
@@ -226,7 +226,7 @@
 ## 2.29.2 - 2019-08-06
 
 ### Fixed
-- Eliminate some ruby warnings relating to ambigious arguments, unused variables, a redefined method, and uninitialized instance variables ([#712](https://github.com/grosser/parallel_tests/pull/712)).
+- Eliminate some ruby warnings relating to ambiguous arguments, unused variables, a redefined method, and uninitialized instance variables ([#712](https://github.com/grosser/parallel_tests/pull/712)).
 
 ## 2.29.1 - 2019-06-13
 

spec/parallel_tests/cucumber/scenarios_spec.rb

@@ -70,7 +70,7 @@
               Examples:
                 | colour  |
                 | magenta |
-                | fuschia |
+                | fuchsia |
 
               @green
               Examples:

spec/parallel_tests/gherkin/runner_behaviour.rb

@@ -215,7 +215,7 @@ def call(*args)
       ParallelTests::Gherkin::Runner.send(:find_tests, *args)
     end
 
-    it "doesn't find bakup files with the same name as test files" do
+    it "doesn't find backup files with the same name as test files" do
       with_files(['a/x.feature', 'a/x.feature.bak']) do |root|
         expect(call(["#{root}/"])).to eq(
           [

spec/parallel_tests/grouper_spec.rb

@@ -96,15 +96,15 @@ def call(num_groups, options = {})
       )
     end
 
-    it "specify_groups aborts when spec passed in doesnt match existing specs" do
+    it "specify_groups aborts when spec passed in doesn't match existing specs" do
       expect do
         call(3, specify_groups: '1|2|6')
       end.to raise_error(
         "Could not find [\"6\"] from --specify-groups in the selected files & folders"
       )
     end
 
-    it "specify_groups aborts when spec passed in doesnt match existing specs again" do
+    it "specify_groups aborts when spec passed in doesn't match existing specs again" do
       expect do
         call(3, specify_groups: '1,6|2')
       end.to raise_error(

spec/parallel_tests/rspec/runner_spec.rb

@@ -17,7 +17,7 @@ def call(*args)
       ParallelTests::RSpec::Runner.run_tests(*args)
     end
 
-    it "runs command using nice when specifed" do
+    it "runs command using nice when specified" do
       ParallelTests.with_pid_file do
         expect(ParallelTests::Test::Runner).to receive(:execute_command_and_capture_output) do |_a, b, _c|
           expect(b.first(2)).to eq(["nice", "rspec"])
@@ -119,7 +119,7 @@ def call(*args)
       ParallelTests::RSpec::Runner.send(:find_tests, *args)
     end
 
-    it "doesn't find bakup files with the same name as test files" do
+    it "doesn't find backup files with the same name as test files" do
       with_files(['a/x_spec.rb', 'a/x_spec.rb.bak']) do |root|
         expect(call(["#{root}/"])).to eq(["#{root}/a/x_spec.rb"])
       end

spec/parallel_tests/tasks_spec.rb

@@ -97,7 +97,7 @@
 
   describe ".suppress_output", unless: Gem.win_platform? do
     def call(command, grep)
-      # Explictly run as a parameter to /bin/bash to simulate how
+      # Explicitly run as a parameter to /bin/bash to simulate how
       # the command will be run by parallel_test --exec
       # This also tests shell escaping of single quotes
       shell_command = [

spec/parallel_tests/test/runner_spec.rb

@@ -352,7 +352,7 @@ def call(*args)
       end
     end
 
-    it "doesn't find bakup files with the same name as test files" do
+    it "doesn't find backup files with the same name as test files" do
       with_files(['a/x_test.rb', 'a/x_test.rb.bak']) do |root|
         expect(call(["#{root}/"])).to eq(
           [