docs: put some more dots in the doc comments of public APIs, found by find_doc_comments_with_no_dots.v

vlib/json/cjson/cjson_wrapper.c.v

@@ -107,7 +107,7 @@ fn C.cJSON_free(voidptr)
 
 //
 
-// version returns the version of cJSON as a string
+// version returns the version of cJSON as a string.
 pub fn version() string {
 	return unsafe { tos3(&char(C.cJSON_Version())) }
 }

vlib/x/json2/encoder.v

@@ -436,8 +436,8 @@ pub fn (f []Any) str() string {
 	return Any(f).json_str()
 }
 
-// str returns the string representation of the `Any` type. Use the `json_str` method
+// str returns the string representation of the `Any` type. Use the `json_str` method.
-// if you want to use the escaped str() version of the `Any` type.
+// If you want to use the escaped str() version of the `Any` type.
 pub fn (f Any) str() string {
 	if f is string {
 		return f

vlib/x/json2/json2.v

@@ -326,7 +326,7 @@ pub fn (f Any) to_time() !time.Time {
 	}
 }
 
-// map_from convert a struct to map of Any
+// map_from converts a struct to a map of Any.
 pub fn map_from[T](t T) map[string]Any {
 	mut m := map[string]Any{}
 	$if T is $struct {

vlib/x/json2/scanner.v

@@ -37,7 +37,7 @@ pub struct Token {
 	col  int       // the column in the source where the token occurred
 }
 
-// full_col returns the full column information which includes the length
+// full_col returns the full column information which includes the length.
 pub fn (t Token) full_col() int {
 	return t.col + t.lit.len
 }

vlib/x/json2/strict/strict.v

@@ -21,7 +21,7 @@ pub:
 	superfluous []string
 }
 
-// strict_check
+// strict_check .
 pub fn strict_check[T](json_data string) StructCheckResult {
 	// REVIEW how performatic is it?
 	$if T is $struct {
@@ -112,7 +112,7 @@ fn get_keys_from_[T]() []string {
 	return struct_keys
 }
 
-// get_keys_from_json
+// get_keys_from_json .
 pub fn get_keys_from_json(tokens []string) []KeyStruct {
 	mut key_structs := []KeyStruct{}
 

vlib/x/json2/types.v

@@ -2,7 +2,7 @@ module json2
 
 import time
 
-// `Any` is a sum type that lists the possible types to be decoded and used.
+// Any is a sum type that lists the possible types to be decoded and used.
 // `Any` priority order for numbers: floats -> signed integers -> unsigned integers
 // `Any` priority order for strings: string -> time.Time
 pub type Any = []Any
@@ -23,21 +23,22 @@ pub type Any = []Any
 	| u8
 	| Null
 
-// Decodable is an interface, that allows custom implementations for decoding structs from JSON encoded values
+// Decodable is an interface, that allows custom implementations for decoding structs from JSON encoded values.
 pub interface Decodable {
 	from_json(f Any)
 }
 
-// Decodable is an interface, that allows custom implementations for encoding structs to their string based JSON representations
+// Encodable is an interface, that allows custom implementations for encoding structs to their string based JSON representations.
 pub interface Encodable {
 	json_str() string
 }
 
-// `Null` struct is a simple representation of the `null` value in JSON.
+// Null is a simple representation of the `null` value in JSON.
 pub struct Null {
 	is_null bool = true
 }
 
+// null is an instance of the Null type, to ease comparisons with it.
 pub const null = Null{}
 
 // ValueKind enumerates the kinds of possible values of the Any sumtype.
@@ -49,7 +50,7 @@ pub enum ValueKind {
 	number
 }
 
-// str returns the string representation of the specific ValueKind
+// str returns the string representation of the specific ValueKind.
 pub fn (k ValueKind) str() string {
 	return match k {
 		.unknown { 'unknown' }