doc: switch links to https

These sites offer https versions of their content.
Using the https versions provides some protection for users.

Signed-off-by: Josh Soref <jsoref@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/MyFirstContribution.txt

@@ -832,7 +832,7 @@ Johannes Schindelin to make life as a Git contributor easier for those used to
 the GitHub PR workflow. It allows contributors to open pull requests against its
 mirror of the Git project, and does some magic to turn the PR into a set of
 emails and send them out for you. It also runs the Git continuous integration
-suite for you. It's documented at http://gitgitgadget.github.io.
+suite for you. It's documented at https://gitgitgadget.github.io/.
 
 [[create-fork]]
 === Forking `git/git` on GitHub

Documentation/git-cvsimport.txt

@@ -221,7 +221,7 @@ Problems related to tags:
 If you suspect that any of these issues may apply to the repository you
 want to import, consider using cvs2git:
 
-* cvs2git (part of cvs2svn), `http://subversion.apache.org/`
+* cvs2git (part of cvs2svn), `https://subversion.apache.org/`
 
 GIT
 ---

Documentation/git-imap-send.txt

@@ -135,7 +135,7 @@ flames ridiculing you if you don't check this.
 
 Thunderbird in particular is known to be problematic.  Thunderbird
 users may wish to visit this web page for more information:
-  http://kb.mozillazine.org/Plain_text_e-mail_-_Thunderbird#Completely_plain_email
+  https://kb.mozillazine.org/Plain_text_e-mail_-_Thunderbird#Completely_plain_email
 
 SEE ALSO
 --------

Documentation/git-send-email.txt

@@ -453,7 +453,7 @@ have been specified, in which case default to 'compose'.
 			998 characters unless a suitable transfer encoding
 			('auto', 'base64', or 'quoted-printable') is used;
 			this is due to SMTP limits as described by
-			http://www.ietf.org/rfc/rfc5322.txt.
+			https://www.ietf.org/rfc/rfc5322.txt.
 --
 +
 Default is the value of `sendemail.validate`; if this is not set,

Documentation/gitcore-tutorial.txt

@@ -1089,7 +1089,7 @@ the remote repository URL in the local repository's config file
 like this:
 
 ------------------------------------------------
-$ git config remote.linus.url http://www.kernel.org/pub/scm/git/git.git/
+$ git config remote.linus.url https://git.kernel.org/pub/scm/git/git.git/
 ------------------------------------------------
 
 and use the "linus" keyword with 'git pull' instead of the full URL.

Documentation/gitprotocol-http.txt

@@ -529,8 +529,8 @@ TODO: Document this further.
 REFERENCES
 ----------
 
-http://www.ietf.org/rfc/rfc1738.txt[RFC 1738: Uniform Resource Locators (URL)]
-http://www.ietf.org/rfc/rfc2616.txt[RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1]
+https://www.ietf.org/rfc/rfc1738.txt[RFC 1738: Uniform Resource Locators (URL)]
+https://www.ietf.org/rfc/rfc2616.txt[RFC 2616: Hypertext Transfer Protocol -- HTTP/1.1]
 
 SEE ALSO
 --------

Documentation/gitweb.conf.txt

@@ -820,7 +820,7 @@ filesystem (i.e. "$projectroot/$project"), `%h` to the current hash
 (\'h' gitweb parameter) and `%b` to the current hash base
 (\'hb' gitweb parameter); `%%` expands to \'%'.
 +
-For example, at the time this page was written, the http://repo.or.cz[]
+For example, at the time this page was written, the https://repo.or.cz[]
 Git hosting site set it to the following to enable graphical log
 (using the third party tool *git-browser*):
 +

Documentation/gitweb.txt

@@ -28,7 +28,7 @@ Gitweb provides a web interface to Git repositories.  Its features include:
   revisions one at a time, viewing the history of the repository.
 * Finding commits which commit messages matches given search term.
 
-See http://repo.or.cz/w/git.git/tree/HEAD:/gitweb/[] for gitweb source code,
+See https://repo.or.cz/w/git.git/tree/HEAD:/gitweb/[] for gitweb source code,
 browsed using gitweb itself.
 
 

Documentation/howto/keep-canonical-history-correct.txt

@@ -213,4 +213,4 @@ The procedure will result in a history that looks like this:
 		 B0--B1---------B2
 ------------
 
-See also http://git-blame.blogspot.com/2013/09/fun-with-first-parent-history.html
+See also https://git-blame.blogspot.com/2013/09/fun-with-first-parent-history.html

Documentation/signoff-option.txt

@@ -9,7 +9,7 @@ endif::git-commit[]
 	the committer has the rights to submit the work under the
 	project's license or agrees to some contributor representation,
 	such as a Developer Certificate of Origin.
-	(See http://developercertificate.org for the one used by the
+	(See https://developercertificate.org for the one used by the
 	Linux kernel and Git projects.)  Consult the documentation or
 	leadership of the project to which you're contributing to
 	understand how the signoffs are used in that project.