8273616: Fix trivial doc typos in the java.base module

Reviewed-by: jrose, iris, lancea, dfuchs, rriggs

src/java.base/share/classes/java/io/CharArrayReader.java

@@ -46,7 +46,7 @@ public class CharArrayReader extends Reader {
     protected int markedPos = 0;
 
     /**
-     *  The index of the end of this buffer.  There is not valid
+     *  The index of the end of this buffer.  There is no valid
      *  data at or beyond this index.
      */
     protected int count;

src/java.base/share/classes/java/io/CharArrayWriter.java

@@ -28,7 +28,7 @@ package java.io;
 import java.util.Arrays;
 
 /**
- * This class implements a character buffer that can be used as an Writer.
+ * This class implements a character buffer that can be used as a Writer.
  * The buffer automatically grows when data is written to the stream.  The data
  * can be retrieved using toCharArray() and toString().
  * <P>

src/java.base/share/classes/java/io/File.java

@@ -2022,7 +2022,7 @@ public class File
             } else {
                 // Name exceeds the maximum path component length: shorten it
 
-                // Attempt to shorten the prefix length to no less then 3
+                // Attempt to shorten the prefix length to no less than 3
                 prefixLength = shortenSubName(prefixLength, excess, 3);
                 excess = prefixLength + nusLength + suffixLength - nameMax;
 

src/java.base/share/classes/java/io/FileCleanable.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 2021, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -65,7 +65,7 @@ final class FileCleanable extends PhantomCleanable<FileDescriptor> {
      * Register a Cleanable with the FileDescriptor
      * if the FileDescriptor is non-null and valid.
      * @implNote
-     * A exception (OutOfMemoryException) will leave the FileDescriptor
+     * An exception (OutOfMemoryException) will leave the FileDescriptor
      * having allocated resources and leak the fd/handle.
      *
      * @param fdo the FileDescriptor; may be null

src/java.base/share/classes/java/io/ObjectInputStream.java

@@ -879,14 +879,14 @@ public class ObjectInputStream
      * objects is disabled until enableResolveObject is called. The
      * enableResolveObject method checks that the stream requesting to resolve
      * object can be trusted. Every reference to serializable objects is passed
-     * to resolveObject.  To insure that the private state of objects is not
+     * to resolveObject.  To ensure that the private state of objects is not
      * unintentionally exposed only trusted streams may use resolveObject.
      *
      * <p>This method is called after an object has been read but before it is
      * returned from readObject.  The default resolveObject method just returns
      * the same object.
      *
-     * <p>When a subclass is replacing objects it must insure that the
+     * <p>When a subclass is replacing objects it must ensure that the
      * substituted object is compatible with every field where the reference
      * will be stored.  Objects whose type is not a subclass of the type of the
      * field or array element abort the deserialization by raising an exception

src/java.base/share/classes/java/io/ObjectOutputStream.java

@@ -568,7 +568,7 @@ public class ObjectOutputStream
      * Object (as opposed to type Serializable) to allow for cases where
      * non-serializable objects are replaced by serializable ones.
      *
-     * <p>When a subclass is replacing objects it must insure that either a
+     * <p>When a subclass is replacing objects it must ensure that either a
      * complementary substitution must be made during deserialization or that
      * the substituted object is compatible with every field where the
      * reference will be stored.  Objects whose type is not a subclass of the
@@ -1419,7 +1419,7 @@ public class ObjectOutputStream
     }
 
     /**
-     * Writes representation of a "ordinary" (i.e., not a String, Class,
+     * Writes representation of an "ordinary" (i.e., not a String, Class,
      * ObjectStreamClass, array, or enum constant) serializable object to the
      * stream.
      */