Add flag to make short names in JS/TS. (#5152)

* Add flag to make short names in JS/TS.

* Synced all missing docs in Compiler.md <-> flatc.cpp.

* Review changes.

docs/source/Compiler.md

@@ -72,6 +72,12 @@ Additional options:
     in quotes, no trailing commas in tables/vectors). By default, no quotes are
     required/generated, and trailing commas are allowed.
 
+-   `--allow-non-utf8` : Pass non-UTF-8 input through parser and emit nonstandard
+    \x escapes in JSON. (Default is to raise parse error on non-UTF-8 input.)
+
+-  `--natural-utf8` : Output strings with UTF-8 as human-readable strings. 
+     By default, UTF-8 characters are printed as \uXXXX escapes."
+
 -   `--defaults-json` : Output fields whose value is equal to the default value
     when writing JSON text.
 
@@ -91,23 +97,36 @@ Additional options:
 -   `--gen-mutable` : Generate additional non-const accessors for mutating
     FlatBuffers in-place.
 
-    `--gen-object-api` : Generate an additional object-based API. This API is
+-   `--gen-onefile` : Generate single output file for C# and Go.
+
+-   `--gen-name-strings` : Generate type name functions for C++.
+
+-   `--gen-object-api` : Generate an additional object-based API. This API is
     more convenient for object construction and mutation than the base API,
     at the cost of efficiency (object allocation). Recommended only to be used
     if other options are insufficient.
 
--   `--gen-compare` :  Generate operator== for object-based API types.
+-   `--gen-compare`  :  Generate operator== for object-based API types.
 
--   `--gen-onefile` :  Generate single output file (useful for C#)
+-   `--gen-nullable` : Add Clang _Nullable for C++ pointer. or @Nullable for Java.
 
--   `--gen-all`: Generate not just code for the current schema files, but
+-   `--gen-generated` : Add @Generated annotation for Java.
+
+-   `--gen-all` : Generate not just code for the current schema files, but
     for all files it includes as well. If the language uses a single file for
     output (by default the case for C++ and JS), all code will end up in
     this one file.
 
--   `--gen-generated`: Add @Generated annotation for Java
+-   `--cpp-ptr-type T` : Set object API pointer type (default std::unique_ptr)
 
--   `--no-js-exports` :  Removes Node.js style export lines (useful for JS)
+-   `--cpp-str-type T` : Set object API string type (default std::string)
+-   T::c_str() and T::length() must be supported.
+
+-   `--object-prefix` : Customise class prefix for C++ object-based API.
+
+-   `--object-suffix` : Customise class suffix for C++ object-based API.
+
+-   `--no-js-exports` : Removes Node.js style export lines (useful for JS)
 
 -   `--goog-js-export` :  Uses goog.exportsSymbol and goog.exportsProperty
     instead of Node.js style exporting.  Needed for compatibility with the
@@ -117,9 +136,16 @@ Additional options:
     instead of Node.js style exporting. Useful when integrating flatbuffers
     with modern Javascript projects.
 
+-   `--go-namespace` : Generate the overrided namespace in Golang.
+
+-   `--go-import` : Generate the overrided import for flatbuffers in Golang.
+     (default is "github.com/google/flatbuffers/go").
+
 -   `--raw-binary` : Allow binaries without a file_indentifier to be read.
     This may crash flatc given a mismatched schema.
 
+-   `--size-prefixed` : Input binaries are size prefixed buffers.
+
 -   `--proto`: Expect input files to be .proto files (protocol buffers).
     Output the corresponding .fbs file.
     Currently supports: `package`, `message`, `enum`, nested declarations,
@@ -127,6 +153,10 @@ Additional options:
     Does not support, but will skip without error: `option`, `service`,
     `extensions`, and most everything else.
 
+-   `--oneof-union` : Translate .proto oneofs to flatbuffer unions.
+
+-   `--grpc` : Generate GRPC interfaces for the specified languages.
+
 -   `--schema`: Serialize schemas instead of JSON (use with -b). This will
     output a binary version of the specified schema that itself corresponds
     to the reflection/reflection.fbs schema. Loading this binary file is the
@@ -138,12 +168,22 @@ Additional options:
     an evolution of. Gives errors if not. Useful to check if schema
     modifications don't break schema evolution rules.
 
+-   `--conform-includes PATH` : Include path for the schema given with 
+    `--conform PATH`.
+
 -   `--include-prefix PATH` : Prefix this path to any generated include
     statements.
 
 -   `--keep-prefix` : Keep original prefix of schema include statement.
 
+-   `--no-fb-impor` : Don't include flatbuffers import statement for TypeScript.
+
+-   `--no-ts-reexpor` : Don't re-export imported dependencies for TypeScript.
+
+-   `--short-name` : Use short function names for JS and TypeScript.
+
 -   `--reflect-types` : Add minimal type reflection to code generation.
+
 -   `--reflect-names` : Add minimal type/name reflection.
 
 -   `--root-type T` : Select or override the default root_type.