Remove reference to kernel type-name

The kernel compiler no longer supports a mechanism to get a kernel by
its type-name, so remove this reference about the type-name.

Author: gmlueck

sycl/doc/extensions/proposed/sycl_ext_oneapi_kernel_compiler_spirv.asciidoc

@@ -161,10 +161,6 @@ sycl::kernel_bundle<sycl::bundle_state::executable> kb = /*...*/;
 sycl::kernel k = kb.ext_oneapi_get_kernel("foo");
 ```
 
-There is no mechanism to decorate a SPIR-V kernel with a type-name, so the
-forms of `kernel_bundle::has_kernel` or `kernel_bundle::get_kernel` that take a
-type-name are not useful for kernels defined in SPIR-V.
-
 === Passing kernel arguments
 
 The SPIR-V *OpEntryPoint* that defines a kernel has an associated *OpFunction*.