Fix typos (#442)

mesecons_random/doc/ghoststone/description.html

@@ -1 +1 @@
-Ghoststones disappear when powered, just like Removestones. But in contrast to Removestones, they Reappear again when not powered anymore and they are also conductive.
+Ghoststones disappear when powered, just like Removestones. But in contrast to Removestones, they reappear again when not powered anymore and they are also conductive.

mesecons_random/doc/removestone/description.html

@@ -1 +1 @@
-Removestones are propably the simplest effectors possible. They simply disappear when powered.
+Removestones are probably the simplest effectors possible. They simply disappear when powered.