Rename transformRelOptions()'s "namspace" parameter to "nameSpace".

The name "namspace" looks like a typo, but it was presumably meant
to avoid using the "namespace" C++ keyword.  This commit renames
the parameter to "nameSpace" to prevent future confusion while
still avoiding the keyword.

Reviewed-by: Álvaro Herrera <alvherre@kurilemu.de>
Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: Ashutosh Bapat <ashutosh.bapat.oss@gmail.com>
Discussion: https://postgr.es/m/aJJxpfsDfiQ1VbJ5%40nathan

src/backend/access/common/reloptions.c

@@ -1164,7 +1164,7 @@ add_local_string_reloption(local_relopts *relopts, const char *name,
  * but we declare them as Datums to avoid including array.h in reloptions.h.
  */
 Datum
-transformRelOptions(Datum oldOptions, List *defList, const char *namspace,
+transformRelOptions(Datum oldOptions, List *defList, const char *nameSpace,
 					const char *const validnsps[], bool acceptOidsOff, bool isReset)
 {
 	Datum		result;
@@ -1200,14 +1200,14 @@ transformRelOptions(Datum oldOptions, List *defList, const char *namspace,
 				int			kw_len;
 
 				/* ignore if not in the same namespace */
-				if (namspace == NULL)
+				if (nameSpace == NULL)
 				{
 					if (def->defnamespace != NULL)
 						continue;
 				}
 				else if (def->defnamespace == NULL)
 					continue;
-				else if (strcmp(def->defnamespace, namspace) != 0)
+				else if (strcmp(def->defnamespace, nameSpace) != 0)
 					continue;
 
 				kw_len = strlen(def->defname);
@@ -1277,14 +1277,14 @@ transformRelOptions(Datum oldOptions, List *defList, const char *namspace,
 			}
 
 			/* ignore if not in the same namespace */
-			if (namspace == NULL)
+			if (nameSpace == NULL)
 			{
 				if (def->defnamespace != NULL)
 					continue;
 			}
 			else if (def->defnamespace == NULL)
 				continue;
-			else if (strcmp(def->defnamespace, namspace) != 0)
+			else if (strcmp(def->defnamespace, nameSpace) != 0)
 				continue;
 
 			/*

src/include/access/reloptions.h

@@ -233,7 +233,7 @@ extern void add_local_string_reloption(local_relopts *relopts, const char *name,
 									   fill_string_relopt filler, int offset);
 
 extern Datum transformRelOptions(Datum oldOptions, List *defList,
-								 const char *namspace, const char *const validnsps[],
+								 const char *nameSpace, const char *const validnsps[],
 								 bool acceptOidsOff, bool isReset);
 extern List *untransformRelOptions(Datum options);
 extern bytea *extractRelOptions(HeapTuple tuple, TupleDesc tupdesc,