docs: Removing references to SVN

README.gclient.md

 # gclient
 
 gclient is a tool for managing a modular checkout of source code from multiple
 source code repositories. It wraps underlying source code management commands
 to provide support for distributing tree updates, status commands, and diffs
 across multiple checked-out working directories.
 
 The gclient script is controlled by a `.gclient` file at the top of a directory
 tree which will contain source code from multiple locations. A `.gclient` file
 is a Python script that defines a list of `solutions` with the following format:
 
     solutions = [
       { "name"        : "src",
-        "url"         : "svn://svnserver/component/trunk/src",
+        "url"         : "https://chromium.googlesource.com/chromium/src.git",
         "custom_deps" : {
           # To use the trunk of a component instead of what's in DEPS:
-          #"component": "https://svnserver/component/trunk/",
+          #"component": "https://github.com/luci/luci-go",
           # To exclude a component from your working copy:
           #"data/really_large_component": None,
         }
       },
     ]
 
 A `solution` is a collection of component pieces of software that will be
 checked out in a specific directory layout for building together.
 
 Each entry in the `solutions` list is defined by a Python dictionary that
@@ skipping 23 matching lines @@
     deps = {
       "src/outside": "https://outside-server/one/repo.git@12345677890123456778901234567789012345677890",
       "src/component": "https://dont-use-github.com/its/unreliable.git@0000000000000000000000000000000000000000",
       "src/relative": "/another/repo.git@aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa",
     }
 
 Each item in the `deps` dictionary consists of a key-value pair. The key is the
 directory into which the component will be checked out, relative to the
 directory containing the `.gclient` file. The value is the URL from which that
 directory will be checked out. If there is no address scheme (that is, no
-`http:` or `svn:` prefix), then the value must begin with a slash and is treated
+`http:` prefix), then the value must begin with a slash and is treated
 relative to the root of the solution's repository.
 
 The URL typically contains a specific revision or change number (as appropriate
 for the underlying SCM system) to `freeze` the external software at a specific,
 known state. Alternatively, if there is no revision or change number, the URL
 will track the latest changes on the specific trunk or branch.