RFR: 8230694: http.keepAlive system property is inconsistently/incorrectly documented

[Daniel Fuchs]

Hi,

Please find below a trivial fix for:

8230694: http.keepAlive system property is inconsistently/incorrectly
          documented
https://bugs.openjdk.java.net/browse/JDK-8230694

The net-properties.html has a typo in the name of the http.keepAlive
network property: it should read `http.keepAlive` not `http.keepalive`.

best regards,

-- daniel

patch:

diff --git 
a/src/java.base/share/classes/java/net/doc-files/net-properties.html 
b/src/java.base/share/classes/java/net/doc-files/net-properties.html
--- a/src/java.base/share/classes/java/net/doc-files/net-properties.html
+++ b/src/java.base/share/classes/java/net/doc-files/net-properties.html
@@ -165,7 +165,7 @@
  	-Dhttp.agent=”foobar” is used, the User-Agent header will
  	contain “foobar Java/1.5.0” if the version of the VM is
  	1.5.0). This property is checked only once at startup.</P>
-	<LI><P><B>{@systemProperty http.keepalive}</B> (default: true)<BR>
+	<LI><P><B>{@systemProperty http.keepAlive}</B> (default: true)<BR>
  	Indicates if persistent connections should be supported. They improve
  	performance by allowing the underlying socket connection to be reused
  	for multiple http requests. If this is set to true then persistent