revert(3p/git): Revert merge of git upstream at v2.26.2

This causes cgit to serve error pages, which is undesirable.

This reverts commit 5229c9b232, reversing
changes made to f2b211131f.

third_party/git/Documentation/config/http.txt

@@ -71,7 +71,7 @@ http.saveCookies::
 http.version::
 	Use the specified HTTP protocol version when communicating with a server.
 	If you want to force the default. The available and default version depend
-	on libcurl. Currently the possible values of
+	on libcurl. Actually the possible values of
 	this option are:
 
 	- HTTP/2
@@ -84,7 +84,7 @@ http.sslVersion::
 	particular configuration of the crypto library in use. Internally
 	this sets the 'CURLOPT_SSL_VERSION' option; see the libcurl
 	documentation for more details on the format of this option and
-	for the ssl version supported. Currently the possible values of
+	for the ssl version supported. Actually the possible values of
 	this option are:
 
 	- sslv2
@@ -199,14 +199,6 @@ http.postBuffer::
 	Transfer-Encoding: chunked is used to avoid creating a
 	massive pack file locally.  Default is 1 MiB, which is
 	sufficient for most requests.
-+
-Note that raising this limit is only effective for disabling chunked
-transfer encoding and therefore should be used only where the remote
-server or a proxy only supports HTTP/1.0 or is noncompliant with the
-HTTP standard.  Raising this is not, in general, an effective solution
-for most push problems, but can increase memory consumption
-significantly since the entire buffer is allocated even for small
-pushes.
 
 http.lowSpeedLimit, http.lowSpeedTime::
 	If the HTTP transfer speed is less than 'http.lowSpeedLimit'