docs: changelog grammar edits (#2673)

* docs: fix improper use of colon

* docs: spell out contractions

* docs: fix ambiguous punctuation

* docs: add missing oxford comma

Author: JustaSqu1d

CHANGELOG.md

@@ -32,8 +32,8 @@ These changes are available on the `master` branch, but have not yet been releas
   ([#2590](https://github.com/Pycord-Development/pycord/pull/2590))
 - Added missing `with_counts` parameter to `fetch_guilds` method.
   ([#2615](https://github.com/Pycord-Development/pycord/pull/2615))
-- Added missing permissions: `Permissions.use_soundboard`,
-  `Permissions.use_external_sounds` and
+- Added the following missing permissions: `Permissions.use_soundboard`,
+  `Permissions.use_external_sounds`, and
   `Permissions.view_creator_monetization_analytics`.
   ([#2620](https://github.com/Pycord-Development/pycord/pull/2620))
 
@@ -54,7 +54,7 @@ These changes are available on the `master` branch, but have not yet been releas
   ([#2595](https://github.com/Pycord-Development/pycord/pull/2595))
 - Fixed `BucketType.category` cooldown commands not functioning correctly in private
   channels. ([#2603](https://github.com/Pycord-Development/pycord/pull/2603))
-- Fixed `SlashCommand`'s `ctx` parameter couldn't be `Union` type.
+- Fixed `ctx` parameter of a `SlashCommand` not being `Union` type.
   ([#2611](https://github.com/Pycord-Development/pycord/pull/2611))
 - Fixed `TypeError` when passing `skus` parameter in `Client.entitlements()`.
   ([#2627](https://github.com/Pycord-Development/pycord/issues/2627))
@@ -390,7 +390,7 @@ These changes are available on the `master` branch, but have not yet been releas
   ([#2075](https://github.com/Pycord-Development/pycord/pull/2075))
 - Fixed `before_invoke` not being run for `SlashCommandGroup`.
   ([#2091](https://github.com/Pycord-Development/pycord/pull/2091))
-- Fixed `AttributeError` when accessing a `Select` object's values when it hasn't been
+- Fixed `AttributeError` when accessing a `Select` object's values when it has not been
   interacted with. ([#2104](https://github.com/Pycord-Development/pycord/pull/2104))
 - Fixed `before_invoke` being run twice for slash subcommands.
   ([#2139](https://github.com/Pycord-Development/pycord/pull/2139))
@@ -421,7 +421,7 @@ These changes are available on the `master` branch, but have not yet been releas
   ([#2196](https://github.com/Pycord-Development/pycord/pull/2196))
 - Fixed `AttributeError` when running permission checks without the `bot` scope.
   ([#2113](https://github.com/Pycord-Development/pycord/issues/2113))
-- Fixed `Option` not working on bridge commands because `ext.commands.Command` doesn't
+- Fixed `Option` not working on bridge commands because `ext.commands.Command` does not
   recognize them. ([#2256](https://github.com/Pycord-Development/pycord/pull/2256))
 - Fixed offset-aware tasks causing `TypeError` when being prepared.
   ([#2271](https://github.com/Pycord-Development/pycord/pull/2271))
@@ -521,7 +521,7 @@ These changes are available on the `master` branch, but have not yet been releas
 ### Fixed
 
 - Fixed bugs in `Page.update_files` where file objects stored in memory were causing an
-  `AttributeError`, and `io.BytesIO` files didn't send properly more than once.
+  `AttributeError`, and `io.BytesIO` files did not send properly more than once.
   ([#1869](https://github.com/Pycord-Development/pycord/pull/1869) &
   [#1881](https://github.com/Pycord-Development/pycord/pull/1881))
 - Fixed bridge groups missing the `parent` attribute.
@@ -876,9 +876,9 @@ These changes are available on the `master` branch, but have not yet been releas
   ([#1453](https://github.com/Pycord-Development/pycord/pull/1453))
 - Update `thread.members` on `thread.fetch_members`.
   ([#1464](https://github.com/Pycord-Development/pycord/pull/1464))
-- Fix the error when Discord doesn't send the `app_permissions` data in `Interaction`.
+- Fix the error when Discord does not send the `app_permissions` data in `Interaction`.
   ([#1467](https://github.com/Pycord-Development/pycord/pull/1467))
-- Fix AttributeError when voice client `play()` function isn't completed yet.
+- Fix AttributeError when voice client `play()` function is not completed yet.
   ([#1360](https://github.com/Pycord-Development/pycord/pull/1360))
 
 ## [2.0.0-rc.1] - 2022-05-17