Add "leveldb" subdirectory to public include paths.

The documentation (README.md and index.md) referred to the
public headers using an incorrect path - fixing.

PiperOrigin-RevId: 252922925

README.md

@@ -189,37 +189,37 @@ uncompressed blocks in memory, the read performance improves again:
 See [doc/index.md](doc/index.md) for more explanation. See
 [doc/impl.md](doc/impl.md) for a brief overview of the implementation.
 
-The public interface is in include/*.h.  Callers should not include or
+The public interface is in include/leveldb/*.h.  Callers should not include or
 rely on the details of any other header files in this package.  Those
 internal APIs may be changed without warning.
 
 Guide to header files:
 
-* **include/db.h**: Main interface to the DB: Start here.
+* **include/leveldb/db.h**: Main interface to the DB: Start here.
 
-* **include/options.h**: Control over the behavior of an entire database,
+* **include/leveldb/options.h**: Control over the behavior of an entire database,
 and also control over the behavior of individual reads and writes.
 
-* **include/comparator.h**: Abstraction for user-specified comparison function.
+* **include/leveldb/comparator.h**: Abstraction for user-specified comparison function.
 If you want just bytewise comparison of keys, you can use the default
 comparator, but clients can write their own comparator implementations if they
 want custom ordering (e.g. to handle different character encodings, etc.).
 
-* **include/iterator.h**: Interface for iterating over data. You can get
+* **include/leveldb/iterator.h**: Interface for iterating over data. You can get
 an iterator from a DB object.
 
-* **include/write_batch.h**: Interface for atomically applying multiple
+* **include/leveldb/write_batch.h**: Interface for atomically applying multiple
 updates to a database.
 
-* **include/slice.h**: A simple module for maintaining a pointer and a
+* **include/leveldb/slice.h**: A simple module for maintaining a pointer and a
 length into some other byte array.
 
-* **include/status.h**: Status is returned from many of the public interfaces
+* **include/leveldb/status.h**: Status is returned from many of the public interfaces
 and is used to report success and various kinds of errors.
 
-* **include/env.h**:
+* **include/leveldb/env.h**:
 Abstraction of the OS environment.  A posix implementation of this interface is
 in util/env_posix.cc.
 
-* **include/table.h, include/table_builder.h**: Lower-level modules that most
+* **include/leveldb/table.h, include/leveldb/table_builder.h**: Lower-level modules that most
 clients probably won't use directly.

doc/index.md

@@ -307,7 +307,7 @@ version numbers found in the keys to decide how to interpret them.
 ## Performance
 
 Performance can be tuned by changing the default values of the types defined in
-`include/leveldb/options.h`.
+`include/options.h`.
 
 ### Block size