treewide: fix a bunch of typos

Detected by lintian, the debian package linter

Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/512>

src/pulse/json.c

@@ -168,7 +168,7 @@ static const char* parse_string(const char *str, pa_json_object *obj) {
                     goto error;
 
                 default:
-                    pa_log("Unexepcted escape value: %c", *str);
+                    pa_log("Unexpected escape value: %c", *str);
                     goto error;
             }
         }