Ending sentences with periods in README.md.

This change was submitted in https://github.com/google/leveldb/pull/575
by @prajwalchalla.

This fixes issue #523.

PiperOrigin-RevId: 252912613

README.md

@@ -195,7 +195,7 @@ internal APIs may be changed without warning.
 
 Guide to header files:
 
-* **include/db.h**: Main interface to the DB: Start here
+* **include/db.h**: Main interface to the DB: Start here.
 
 * **include/options.h**: Control over the behavior of an entire database,
 and also control over the behavior of individual reads and writes.
@@ -203,7 +203,7 @@ and also control over the behavior of individual reads and writes.
 * **include/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.)
+want custom ordering (e.g. to handle different character encodings, etc.).
 
 * **include/iterator.h**: Interface for iterating over data. You can get
 an iterator from a DB object.
@@ -219,7 +219,7 @@ and is used to report success and various kinds of errors.
 
 * **include/env.h**:
 Abstraction of the OS environment.  A posix implementation of this interface is
-in util/env_posix.cc
+in util/env_posix.cc.
 
 * **include/table.h, include/table_builder.h**: Lower-level modules that most
-clients probably won't use directly
+clients probably won't use directly.