doc/go1.15: add missing slashes

This saves a redirect and makes the document more consistent.

For #37419

Change-Id: Ic3bd62f8caacf67ffe43a359624e11bed8b8cfaf
Reviewed-on: https://go-review.googlesource.com/c/go/+/237540
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
diff --git a/doc/go1.15.html b/doc/go1.15.html
index 4b79dee..83d5ca1 100644
--- a/doc/go1.15.html
+++ b/doc/go1.15.html
@@ -378,9 +378,9 @@
   <dd>
     <p><!-- CL 231417, CL 225460 -->
       The <code>PrivateKey</code> and <code>PublicKey</code> types in the
-      <a href="/pkg/crypto/rsa"><code>crypto/rsa</code></a>,
-      <a href="/pkg/crypto/ecdsa"><code>crypto/ecdsa</code></a>, and
-      <a href="/pkg/crypto/ed25519"><code>crypto/ed25519</code></a> packages
+      <a href="/pkg/crypto/rsa/"><code>crypto/rsa</code></a>,
+      <a href="/pkg/crypto/ecdsa/"><code>crypto/ecdsa</code></a>, and
+      <a href="/pkg/crypto/ed25519/"><code>crypto/ed25519</code></a> packages
       now have an <code>Equal</code> method to compare keys for equivalence
       or to make type-safe interfaces for public keys. The method signature
       is compatible with
@@ -559,7 +559,7 @@
   </dd>
 </dl><!-- database/sql -->
 
-<dl id="database/sql/driver"><dt><a href="/pkg/database/sql/driver">database/sql/driver</a></dt>
+<dl id="database/sql/driver"><dt><a href="/pkg/database/sql/driver/">database/sql/driver</a></dt>
   <dd>
     <p><!-- CL 174122 -->
       The new <a href="/pkg/database/sql/driver/#Validator"><code>Validator</code></a>
@@ -672,7 +672,7 @@
       <code>Conn.SetReadDeadline</code>,
       or <code>Conn.SetWriteDeadline</code> methods, it will now
       return an error that is or wraps
-      <a href="/pkg/os#ErrDeadlineExceeded"><code>os.ErrDeadlineExceeded</code></a>.
+      <a href="/pkg/os/#ErrDeadlineExceeded"><code>os.ErrDeadlineExceeded</code></a>.
       This may be used to reliably detect whether an error is due to
       an exceeded deadline.
       Earlier releases recommended calling the <code>Timeout</code>
@@ -751,7 +751,7 @@
       <a href="/pkg/os/#File.SetReadDeadline"><code>File.SetReadDeadline</code></a>,
       or <a href="/pkg/os/#File.SetWriteDeadline"><code>File.SetWriteDeadline</code></a>
       methods, it will now return an error that is or wraps
-      <a href="/pkg/os#ErrDeadlineExceeded"><code>os.ErrDeadlineExceeded</code></a>.
+      <a href="/pkg/os/#ErrDeadlineExceeded"><code>os.ErrDeadlineExceeded</code></a>.
       This may be used to reliably detect whether an error is due to
       an exceeded deadline.
       Earlier releases recommended calling the <code>Timeout</code>
@@ -817,7 +817,7 @@
   </dd>
 </dl>
 
-<dl id="pkg-runtime-pprof"><dt><a href="/pkg/runtime/pprof">runtime/pprof</a></dt>
+<dl id="pkg-runtime-pprof"><dt><a href="/pkg/runtime/pprof/">runtime/pprof</a></dt>
   <dd>
     <p><!-- CL 189318 -->
       The goroutine profile includes the profile labels associated with each goroutine