chore: fix some comments (apache#1184)

Signed-off-by: sunxunle <sunxunle@gmail.com>

Author: sunxunle

README.md

@@ -151,7 +151,7 @@ maintain this crate is limited. Please read the following sections carefully.
 ### New Syntax
 
 The most commonly accepted PRs add support for or fix a bug in a feature in the
-SQL standard, or a a popular RDBMS, such as Microsoft SQL
+SQL standard, or a popular RDBMS, such as Microsoft SQL
 Server or PostgreSQL, will likely be accepted after a brief
 review.  Any SQL feature that is dialect specific should be parsed by *both* the relevant [`Dialect`] 
 as well as [`GenericDialect`].

src/ast/mod.rs

@@ -4649,7 +4649,7 @@ pub struct Function {
     pub args: Vec<FunctionArg>,
     /// e.g. `x > 5` in `COUNT(x) FILTER (WHERE x > 5)`
     pub filter: Option<Box<Expr>>,
-    // Snowflake/MSSQL supports diffrent options for null treatment in rank functions
+    // Snowflake/MSSQL supports different options for null treatment in rank functions
     pub null_treatment: Option<NullTreatment>,
     pub over: Option<WindowType>,
     // aggregate functions may specify eg `COUNT(DISTINCT x)`

src/dialect/mod.rs

@@ -93,7 +93,7 @@ macro_rules! dialect_of {
 pub trait Dialect: Debug + Any {
     /// Determine the [`TypeId`] of this dialect.
     ///
-    /// By default, return the same [`TypeId`] as [`Any::type_id`]. Can be overriden
+    /// By default, return the same [`TypeId`] as [`Any::type_id`]. Can be overridden
     /// by dialects that behave like other dialects
     /// (for example when wrapping a dialect).
     fn dialect(&self) -> TypeId {

tests/sqlparser_sqlite.rs

@@ -55,7 +55,7 @@ fn pragma_eq_style() {
     }
 }
 #[test]
-fn pragma_funciton_style() {
+fn pragma_function_style() {
     let sql = "PRAGMA cache_size(10)";
     match sqlite_and_generic().verified_stmt(sql) {
         Statement::Pragma {
@@ -103,7 +103,7 @@ fn pragma_function_string_style() {
 }
 
 #[test]
-fn pragma_eq_placehoder_style() {
+fn pragma_eq_placeholder_style() {
     let sql = "PRAGMA table_info = ?";
     match sqlite_and_generic().verified_stmt(sql) {
         Statement::Pragma {