docs: namespaces concepts page #4660

Job	Run time
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	33s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	9s
build (1.22.x, GOARCH=amd64 GOOS=linux, gno)	26s
build (1.22.x, GOARCH=wasm GOOS=js, gno)	26s
test (1.21.x, _test.cmd)	1m 39s
test (1.21.x, _test.pkg)	1m 0s
test (1.21.x, _test.gnolang.native)	35s
test (1.21.x, _test.gnolang.stdlibs)	1m 40s
test (1.21.x, _test.gnolang.realm)	1m 15s
test (1.21.x, _test.gnolang.pkg0)	2m 0s
test (1.21.x, _test.gnolang.pkg1)	9m 53s
test (1.21.x, _test.gnolang.pkg2)	4m 19s
test (1.21.x, _test.gnolang.other)	38s
test (1.22.x, _test.cmd)	1m 31s
test (1.22.x, _test.pkg)	57s
test (1.22.x, _test.gnolang.native)	35s
test (1.22.x, _test.gnolang.stdlibs)	1m 28s
test (1.22.x, _test.gnolang.realm)	37s
test (1.22.x, _test.gnolang.pkg0)	1m 45s
test (1.22.x, _test.gnolang.pkg1)	9m 46s
test (1.22.x, _test.gnolang.pkg2)	4m 4s
test (1.22.x, _test.gnolang.other)	26s
upload-coverage	19s
	46m 1s

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