Rollup merge of rust-lang#59498 - mbrubeck:write_all, r=Centril

Use 'write_all' instead of 'write' in example code

Using `write` without looping and checking the result can cause silent data loss.  Example code should use `write_all` so that people don't copy this pattern.  (Of course this does not include example code for docs that are specifically about the `write` method.)

src/libstd/io/mod.rs

@@ -1151,7 +1151,7 @@ pub trait Write {
     /// fn main() -> std::io::Result<()> {
     ///     let mut buffer = BufWriter::new(File::create("foo.txt")?);
     ///
-    ///     buffer.write(b"some bytes")?;
+    ///     buffer.write_all(b"some bytes")?;
     ///     buffer.flush()?;
     ///     Ok(())
     /// }

src/libstd/io/stdio.rs

@@ -405,7 +405,7 @@ pub struct StdoutLock<'a> {
 /// use std::io::{self, Write};
 ///
 /// fn main() -> io::Result<()> {
-///     io::stdout().write(b"hello world")?;
+///     io::stdout().write_all(b"hello world")?;
 ///
 ///     Ok(())
 /// }
@@ -420,7 +420,7 @@ pub struct StdoutLock<'a> {
 ///     let stdout = io::stdout();
 ///     let mut handle = stdout.lock();
 ///
-///     handle.write(b"hello world")?;
+///     handle.write_all(b"hello world")?;
 ///
 ///     Ok(())
 /// }
@@ -460,7 +460,7 @@ impl Stdout {
     ///     let stdout = io::stdout();
     ///     let mut handle = stdout.lock();
     ///
-    ///     handle.write(b"hello world")?;
+    ///     handle.write_all(b"hello world")?;
     ///
     ///     Ok(())
     /// }
@@ -558,7 +558,7 @@ pub struct StderrLock<'a> {
 /// use std::io::{self, Write};
 ///
 /// fn main() -> io::Result<()> {
-///     io::stderr().write(b"hello world")?;
+///     io::stderr().write_all(b"hello world")?;
 ///
 ///     Ok(())
 /// }
@@ -573,7 +573,7 @@ pub struct StderrLock<'a> {
 ///     let stderr = io::stderr();
 ///     let mut handle = stderr.lock();
 ///
-///     handle.write(b"hello world")?;
+///     handle.write_all(b"hello world")?;
 ///
 ///     Ok(())
 /// }
@@ -613,7 +613,7 @@ impl Stderr {
     ///     let stderr = io::stderr();
     ///     let mut handle = stderr.lock();
     ///
-    ///     handle.write(b"hello world")?;
+    ///     handle.write_all(b"hello world")?;
     ///
     ///     Ok(())
     /// }