patch 8.1.2243: typos in comments

Problem:    Typos in comments.
Solution:   Fix the typos. (Dominique Pelle, closes #5160)  Also adjust
            formatting a bit.
diff --git a/src/crypt.c b/src/crypt.c
index 43a7167..729073a 100644
--- a/src/crypt.c
+++ b/src/crypt.c
@@ -206,7 +206,7 @@
 }
 
 /*
- * Get crypt method specifc length of the file header in bytes.
+ * Get crypt method specific length of the file header in bytes.
  */
     int
 crypt_get_header_len(int method_nr)