fix: correct some errors on the doc file

README.md

@@ -25,10 +25,10 @@ To do so, run via your command line on Linux or your powershell on Windows:
 
 ```shell
 cd [PENE repository] 
-git sumdoule update --init
-git sumodule foreach 'git checkout main'
-cmake . 
-cmake --build -DUSE_FMA_INTRINSIC=1 .
+git submodule update --init
+git submodule foreach 'git checkout main'
+cmake -DUSE_FMA_INTRINSIC=1 . 
+cmake --build .
 ctest -C Debug
 ``` 
 On Linux, you can create a folder, then generate and build the project inside it. 
@@ -49,7 +49,7 @@ Without specifying any options, this command will execute your code under PENE w
 
 # How to instrument your code with PENE?
 
-PENE offers two ways to instrument code. A cross-plateforme based on backend [Verrou](https://github.com/edf-hpc/verrou) named **fp-replace** and one based one [Interflop](https://github.com/interflop), available on Linux only.
+PENE offers two ways to instrument code. A cross-plateforme based on backend [Verrou](https://github.com/edf-hpc/verrou) named **fp-replace** and on based one [Interflop](https://github.com/interflop), available on Linux only.
 
 ## **FP-REPLACE** mode
 To instrument your code, you can use the **fp-replace** option:
@@ -77,7 +77,7 @@ where:
 
 ## **INTERFLOP** mode (Linux only)
 
-The interflop mode allows to dynamicaly load from 1 to 16 backends and make them work separately. Available backends are :
+The interflop mode allows to dynamicaly load up to 16 backends and make them work separately. Available backends are :
 
 | Backend                                                                   | Description                                                                                                                          |
 |---------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------|
@@ -102,14 +102,16 @@ Exemple of usage with Verrou :
 VFC_BACKENDS="libinterflop_verrou.so --rounding-mode=upward" path/to/pin -t path/to/pene.so/or/pene.so -interflop -- path/to/executable
 
 #Vector mode
-
 VFC_BACKENDS="libinterflop_verrou.so --rounding-mode=downward" path/to/pin -t path/to/pene.so/or/pene.so -interflop -vector-mode -- path/to/executable
 
 #Multiple backends
-
 VFC_BACKENDS="libinterflop_verrou.so --rounding-mode=upward; libinterflop_vprec.so --mode=full --precision-binary32=23 --debug" path/to/pin -t path/to/pene.so/or/pene.so -interflop -- path/to/executable
 ```
 
+/!\ Note :
+- Proposed backends fully work only in scalar mode
+- For backend Verrou, only nearest, upward and downward modes are available on vector mode
+
 ## How to exclude parts of the code from instrumentation?
 
 You can filter which parts of the code your want to instrument using the option `-exclude` along with an exclusion file containing a list of the functions you want to exclude.