docs: Fix typos and grammatical errors in code and documentation

- Fix typo "Faled" -> "Failed" in content_type.rb error message
- Fix typo "resturned" -> "returned" in format.rb documentation
- Fix missing word "encode" in text_format.rb documentation
- Fix typo "cotent" -> "content" in opaque.rb documentation
- Fix typo "charseet" -> "charset" in test description
- Add vendor/ to .gitignore

Co-authored-by: dazuma <[email protected]>

Author: Copilot

.gitignore

@@ -7,3 +7,4 @@ doc/
 pkg/
 tmp/
 features/conformance
+vendor/

lib/cloud_events/content_type.rb

@@ -131,7 +131,7 @@ def parse(str)
       @subtype_base, @subtype_format = @subtype.split("+", 2)
       until str.empty?
         str = consume_special(str, ";")
-        name, str = consume_token(str, downcase: true, error_message: "Faled to parse attribute name")
+        name, str = consume_token(str, downcase: true, error_message: "Failed to parse attribute name")
         str = consume_special(str, "=", error_message: "Failed to find value for attribute #{name}")
         val, str = consume_token_or_quoted(str, error_message: "Failed to parse value for attribute #{name}")
         @params << [name, val]

lib/cloud_events/event/opaque.rb

@@ -8,7 +8,7 @@ module Event
     # single event or a batch of events.
     #
     # The event data is retained in a form that can be reserialized (in a
-    # structured cotent mode in the same format) but cannot otherwise be
+    # structured content mode in the same format) but cannot otherwise be
     # inspected.
     #
     # This object is immutable, and Ractor-shareable on Ruby 3.

lib/cloud_events/format.rb

@@ -30,7 +30,7 @@ module CloudEvents
   #
   # Both the keyword arguments recognized and the returned hash members may
   # vary from formatter to formatter; similarly, the keyword arguments provided
-  # and the resturned hash members recognized may also vary for different
+  # and the returned hash members recognized may also vary for different
   # callers. This interface will define a set of common argument and result key
   # names, but both callers and formatters must gracefully handle the case of
   # missing or extra information. For example, if a formatter expects a certain

lib/cloud_events/text_format.rb

@@ -37,7 +37,7 @@ def decode_data(content: nil, content_type: nil, **_other_kwargs)
     end
 
     ##
-    # Trivially an event data object using text format.
+    # Trivially encode an event data object using text format.
     # See {CloudEvents::Format#encode_data} for a general description.
     #
     # Expects `:data` and `:content_type` arguments, and will decline the

test/test_content_type.rb

@@ -41,7 +41,7 @@
     assert Ractor.shareable?(content_type) if defined? Ractor
   end
 
-  it "recognizes charseet param" do
+  it "recognizes charset param" do
     content_type = CloudEvents::ContentType.new("application/json; charset=utf-8")
     assert_equal [["charset", "utf-8"]], content_type.params
     assert_equal "utf-8", content_type.charset