Fix some typos. (#42407)

README.md

@@ -49,7 +49,7 @@ Now our developers can acquire Tesla V100 online computing resources for free. I
      [Click here to learn more](https://github.com/PaddlePaddle/Fleet)
 
 
-- **High-Performance Inference Engines for Comprehensive Deployment Enviroments**
+- **High-Performance Inference Engines for Comprehensive Deployment Environments**
 
    PaddlePaddle is not only compatible with models trained in 3rd party open-source frameworks , but also offers complete inference products for various production scenarios. Our inference product line includes [Paddle Inference](https://paddle-inference.readthedocs.io/en/latest/product_introduction/summary.html): Native inference library for high-performance server and cloud inference; [Paddle Serving](https://github.com/PaddlePaddle/Serving): A service-oriented framework suitable for distributed and pipeline productions; [Paddle Lite](https://github.com/PaddlePaddle/Paddle-Lite): Ultra-Lightweight inference engine for mobile and IoT environments; [Paddle.js](https://www.paddlepaddle.org.cn/paddle/paddlejs): A frontend inference engine for browser and mini-apps. Furthermore, by great amounts of optimization with leading hardware in each scenario, Paddle inference engines outperform most of the other mainstream frameworks.
      

cmake/coverallsGcovJsons.cmake

@@ -238,7 +238,7 @@ foreach (GCOV_FILE ${GCOV_FILES})
 	message("MD5: ${GCOV_SRC_PATH} = ${GCOV_CONTENTS_MD5}")
 
 	# Loads the gcov file as a list of lines.
-	# (We first open the file and replace all occurences of [] with _
+	# (We first open the file and replace all occurrences of [] with _
 	#  because CMake will fail to parse a line containing unmatched brackets...
 	#  also the \ to escaped \n in macros screws up things.)
 	# https://public.kitware.com/Bug/view.php?id=15369

tools/windows/build_compile_environment.bat

@@ -13,11 +13,11 @@
 :: limitations under the License.
 ::
 :: ===============================
-:: Build Paddle compile enviroment
+:: Build Paddle compile environment
 :: ===============================
 :: Description:
 ::   
-::   Install compile enviroment for xly CI.
+::   Install compile environment for xly CI.
 ::
 ::   Include:
 ::     1. CMake 3.17.0