Fix descriptions

Author: rwestMSFT

docs/t-sql/data-types/binary-and-varbinary-transact-sql.md

@@ -1,6 +1,6 @@
 ---
 title: "binary and varbinary (Transact-SQL)"
-description: "binary and varbinary (Transact-SQL)"
+description: "Binary data types of either fixed length or variable length."
 author: MikeRayMSFT
 ms.author: mikeray
 ms.reviewer: randolphwest

docs/t-sql/data-types/char-and-varchar-transact-sql.md

@@ -1,6 +1,6 @@
 ---
 title: char and varchar (Transact-SQL)
-description: "char and varchar (Transact-SQL)"
+description: "Character data types that are either fixed-size (char), or variable-size (varchar)."
 author: MikeRayMSFT
 ms.author: mikeray
 ms.reviewer: randolphwest

docs/t-sql/data-types/nchar-and-nvarchar-transact-sql.md

@@ -1,6 +1,6 @@
 ---
 title: "nchar and nvarchar (Transact-SQL)"
-description: "nchar and nvarchar (Transact-SQL)"
+description: "Unicode character data types that are either fixed-size (nchar), or variable-size (nvarchar)."
 author: MikeRayMSFT
 ms.author: mikeray
 ms.reviewer: randolphwest

docs/t-sql/data-types/string-and-binary-types.md

@@ -1,6 +1,6 @@
 ---
 title: "String and Binary Types"
-description: "String and Binary Types"
+description: "Learn about the string and binary types in the Database Engine, including binary, varbinary, char, nchar, varchar, and nvarchar."
 author: MikeRayMSFT
 ms.author: mikeray
 ms.reviewer: randolphwest