GNUmakefile: add spellfix target, use it. (#4387)

TODO: Remove the go.mod/go.sum in internal/tools once doing so doesn't break CI (e.g. once we drop support for go 1.19)

* builder/cc1as.h: fix typo found by 'make spell'
* GNUmakefile: remove exception for inbetween, fix instance now found by 'make spell'
* GNUmakefile: remove exception for programmmer, fix instance now found by 'make spell'
* go.mod: use updated misspell. GNUmakefile: add spellfix target, use it.
* ignore directories properly when invoking spellchecker.
* make spell: give internal/tools its own go.mod, as misspell requires newer go
* make lint: depend on tools and run the installed revive
(which was perhaps implied by the change that added revive to internal/tools,
but not required in GNUmakefile until we gave internal/tools its own temporary go.mod)
* .github: now that 'make spell' works well, run it from CI
* GNUmakefile: make spell now aborts if it finds misspelt words, so what it finds doesn't get lost in CI logs
* GNUmakefile: tools: avoid -C option on go generate to make test-llvm15-go119 circleci job happy, see
https://cs.opensource.google/go/go/+/2af48cbb7d85e5fdc635e75b99f949010c607786
* internal/tools/go.mod: fix format of go version to leave out patchlevel, else go complains.

src/os/exec.go

@@ -88,6 +88,7 @@ func (p *Process) Release() error {
 	return p.release()
 }
 
+// FindProcess looks for a running process by its pid.
 // Keep compatibility with golang and always succeed and return new proc with pid on Linux.
 func FindProcess(pid int) (*Process, error) {
 	return findProcess(pid)

src/os/os_anyos_test.go

@@ -56,7 +56,7 @@ func TestStatBadDir(t *testing.T) {
 	badDir := filepath.Join(dir, "not-exist/really-not-exist")
 	_, err := Stat(badDir)
 	if pe, ok := err.(*fs.PathError); !ok || !IsNotExist(err) || pe.Path != badDir {
-		t.Errorf("Mkdir error = %#v; want PathError for path %q satisifying IsNotExist", err, badDir)
+		t.Errorf("Mkdir error = %#v; want PathError for path %q satisfying IsNotExist", err, badDir)
 	}
 }
 

src/os/tempfile_test.go

@@ -158,7 +158,7 @@ func TestMkdirTempBadDir(t *testing.T) {
 	badDir := filepath.Join(dir, "not-exist")
 	_, err = MkdirTemp(badDir, "foo")
 	if pe, ok := err.(*fs.PathError); !ok || !IsNotExist(err) || pe.Path != badDir {
-		t.Errorf("TempDir error = %#v; want PathError for path %q satisifying IsNotExist", err, badDir)
+		t.Errorf("TempDir error = %#v; want PathError for path %q satisfying IsNotExist", err, badDir)
 	}
 }