Update documents (#984)

Fix wamr-ide link error, set wamr-ide to experimental and fix README issues

README.md

@@ -6,7 +6,7 @@ WebAssembly Micro Runtime
 
 [BA]: https://bytecodealliance.org/
 
-WebAssembly Micro Runtime (WAMR) is a lightweight standalone WebAssembly (WASM) runtime with small footprint, high performance and highly configurable features for applications cross from embedded, IoT, edge to Trusted Execution Environment (TEE), smart contract, cloud native applications and so on. It includes a few parts as below:
+WebAssembly Micro Runtime (WAMR) is a lightweight standalone WebAssembly (WASM) runtime with small footprint, high performance and highly configurable features for applications cross from embedded, IoT, edge to Trusted Execution Environment (TEE), smart contract, cloud native and so on. It includes a few parts as below:
 - The [**"iwasm" VM core**](./README.md#iwasm-vm-core) to run WASM applications, supporting interpreter mode, AOT mode (Ahead-of-Time compilation) and JIT mode (Just-in-Time compilation)
 
 - The [**"wamrc" AOT compiler**](./README.md#build-wamrc-aot-compiler) to compile WASM file into AOT file for best performance and smaller runtime footprint, which is run by "iwasm" VM Core
@@ -61,7 +61,7 @@ The iwasm supports the following architectures:
 - RISCV64, RISCV32 (RISC-V LP64 and RISC-V LP64D are tested)
 - XTENSA, MIPS, ARC
 
-Following platforms are supported, click each link below for how to build iwasm on that platform. Refer to [WAMR porting guide](./doc/port_wamr.md) for how to port WAMR to a new platform.
+The following platforms are supported, click each link below for how to build iwasm on that platform. Refer to [WAMR porting guide](./doc/port_wamr.md) for how to port WAMR to a new platform.
 
 - [Linux](./doc/build_wamr.md#linux),  [Linux SGX (Intel Software Guard Extension)](./doc/linux_sgx.md),  [MacOS](./doc/build_wamr.md#macos),  [Android](./doc/build_wamr.md#android), [Windows](./doc/build_wamr.md#windows)
 - [Zephyr](./doc/build_wamr.md#zephyr),  [AliOS-Things](./doc/build_wamr.md#alios-things),  [VxWorks](./doc/build_wamr.md#vxworks), [NuttX](./doc/build_wamr.md#nuttx), [RT-Thread](./doc/build_wamr.md#RT-Thread), [ESP-IDF](./doc/build_wamr.md#esp-idf)

doc/memory_tune.md

@@ -5,7 +5,7 @@ Memory model and memory usage tunning
 
 The memory model of WAMR can be basically described as below:
 
-![WAMR memory model](./pics/wamr_memory_model.png "WAMR memory model")
+<center><img src="./pics/wamr_memory_model.png" width="75%" height="75%"></img></center>
 
 Note:
 - **global heap**: the heap to allocate memory for runtime data structures, including wasm module, wasm module instance, exec env, wasm operand stack and so on. It is initialized by `wasm_runtime_init` or `wasm_runtime_full_init`. And for `wasm_runtime_full_init`, developer can specify the memory allocation mode with `RuntimeInitArgs *init_args`: allocate memory from a user defined byte buffer, from user defined allocation function, or from the platform's os_malloc function. Refer to [wasm_export.h](../core/iwasm/include/wasm_export.h#L98-L141) and [Embedding WAMR guideline](doc/embed_wamr.md#the-runtime-initialization) for more details. And developer can use `wasm_runtime_malloc/wasm_runtime_free` to allocate/free memory from/to the global heap.

test-tools/wamr-ide/README.md

@@ -1,4 +1,4 @@
-# WAMR-IDE
+# WAMR-IDE (Experimental)
 
 ## Introduction
 
@@ -62,7 +62,7 @@ The WAMR-IDE is an Integrated Development Environment to develop WebAssembly app
 
 #### `WAMR-IDE` extension contains 2 components as following picture showing. `Project management` and `Execution management`
 
-![wamr_ide_main_menu](../Media/wamr_ide_main_menu.png "wamr-ide main menu")
+![wamr_ide_main_menu](./Media/wamr_ide_main_menu.png "wamr-ide main menu")
 
 ### Project Management