fix english syntax issue

Author: vincentlauvlwj

README.md

@@ -313,7 +313,7 @@ employee.salary = 100
 employee.flushChanges()
 ```
 
-Delete a entity from database: 
+Delete an entity from database: 
 
 ```kotlin
 val employee = database.employees.find { it.id eq 2 } ?: return

ktorm-global/src/main/kotlin/org/ktorm/global/EntitySequence.kt

@@ -66,7 +66,7 @@ public fun <E : Entity<E>> Table<E>.updateEntity(entity: E): Int {
 }
 
 /**
- * Obtain a entity object matching the given [predicate], auto left joining all the reference tables.
+ * Obtain an entity object matching the given [predicate], auto left joining all the reference tables.
  */
 @Deprecated("ktorm-global will be removed in the future, please migrate to the standard API.")
 public inline fun <E : Any, T : BaseTable<E>> T.findOne(predicate: (T) -> ColumnDeclaring<Boolean>): E? {