Fix typos

NOTICE.md

@@ -83,7 +83,7 @@ major authors were omitted by oversight.
     Adriaan Moors, Paul Phillips and others.
 
   * dotty.tools.dottydoc: The Dottydoc documentation utility ships some
-    third-party Javascript and CSS libraries which are located under
+    third-party JavaScript and CSS libraries which are located under
     dotty-doc/resources/css/, dotty-doc/resources/js/, docs/css/ and
     docs/js/. Please refer to the license header of the concerned files for
     details.

compiler/src/dotty/tools/io/AbstractFile.scala

@@ -238,7 +238,7 @@ abstract class AbstractFile extends Iterable[AbstractFile] {
   private def fileOrSubdirectoryNamed(name: String, isDir: Boolean): AbstractFile =
     lookupName(name, isDir) match {
       case null =>
-        // the optional exception may be thrown for symlinks, notably /tmp on MacOS.
+        // the optional exception may be thrown for symlinks, notably /tmp on macOS.
         // isDirectory tests for existing directory. The default behavior is hypothetical isDirectory(jpath, FOLLOW_LINKS).
         try Files.createDirectories(jpath)
         catch { case _: FileAlreadyExistsException if Files.isDirectory(jpath) => }

docs/blog/_posts/2018-10-10-10th-dotty-milestone-release.md

@@ -162,7 +162,7 @@ Releases are available for download on the _Releases_
 section of the Dotty repository:
 [https://github.com/lampepfl/dotty/releases](https://github.com/lampepfl/dotty/releases)
 
-For MacOs users, we also provide a [homebrew](https://brew.sh/) package that can be installed by
+For macOS users, we also provide a [homebrew](https://brew.sh/) package that can be installed by
 running:
 
 ```shell

docs/blog/_posts/2018-11-30-11th-dotty-milestone-release.md

@@ -148,7 +148,7 @@ Releases are available for download on the _Releases_
 section of the Dotty repository:
 [https://github.com/lampepfl/dotty/releases](https://github.com/lampepfl/dotty/releases)
 
-For MacOs users, we also provide a [homebrew](https://brew.sh/) package that can be installed by
+For macOS users, we also provide a [homebrew](https://brew.sh/) package that can be installed by
 running:
 
 ```shell

docs/blog/_posts/2019-01-21-12th-dotty-milestone-release.md

@@ -139,7 +139,7 @@ Releases are available for download on the _Releases_
 section of the Dotty repository:
 [https://github.com/lampepfl/dotty/releases](https://github.com/lampepfl/dotty/releases)
 
-For MacOs users, we also provide a [homebrew](https://brew.sh/) package that can be installed by
+For macOS users, we also provide a [homebrew](https://brew.sh/) package that can be installed by
 running:
 
 ```shell

docs/docs/contributing/debug-tests.md

@@ -8,7 +8,7 @@ title: Tests for Debuggability
 - JDB
 - expect
 
-Both are usually pre-installed on Mac OS and linux distributions.
+Both are usually pre-installed on macOS and linux distributions.
 
 ## Debug Manually with JDB
 

docs/docs/reference/contextual/multiversal-equality.md

@@ -210,4 +210,4 @@ work under `-language:strictEquality`, since otherwise the universal `Eq[Any]` i
 
 
 More on multiversal equality is found in a [blog post](http://www.scala-lang.org/blog/2016/05/06/multiversal-equality.html)
-and a [Github issue](https://github.com/lampepfl/dotty/issues/1247).
+and a [GitHub issue](https://github.com/lampepfl/dotty/issues/1247).