repart: fix option spelling and file path in comments and manpage (#41534)

Two minor fixes in comments and documentation:

 - Update comment that mentions file renamed in 211d2f972d
 - Do not reference `SizeMin=` where `SizeMinBytes=` is meant

No functional changes.

src/repart/repart.c

@@ -1116,7 +1116,7 @@ static uint64_t partition_min_size(const Context *context, const Partition *p) {
          * exists the current size is what we really need. If it doesn't exist yet refuse to allocate less
          * than 4K.
          *
-         * DEFAULT_MIN_SIZE is the default SizeMin= we configure if nothing else is specified. */
+         * DEFAULT_MIN_SIZE is the default SizeMinBytes= we configure if nothing else is specified. */
 
         if (PARTITION_IS_FOREIGN(p)) {
                 /* Don't allow changing size of partitions not managed by us */

src/test/test-specifier.c

@@ -156,7 +156,7 @@ TEST(specifiers_assorted) {
         const sd_id128_t id = SD_ID128_ALLF;
         const uint64_t llu = UINT64_MAX;
         const Specifier table[] = {
-                /* Used in src/partition/repart.c */
+                /* Used in src/repart/repart.c */
                 { 'a', specifier_uuid,      &id },
                 { 'b', specifier_uint64,    &llu },
                 {}