Update docs with new --sanitizer flag, fixes google#488. (google#505)

Author: inferno-chromium

docs/new_project_guide.md

@@ -156,7 +156,7 @@ Use the helper script to build docker image and [fuzz targets](glossary.md#fuzz-
 ```bash
 $ cd /path/to/oss-fuzz
 $ python infra/helper.py build_image $PROJECT_NAME
-$ python infra/helper.py build_fuzzers --sanitizer=<address/memory/undefined> $PROJECT_NAME
+$ python infra/helper.py build_fuzzers --sanitizer <address/memory/undefined> $PROJECT_NAME
 ```
 
 This should place the built binaries into `/path/to/oss-fuzz/build/out/$PROJECT_NAME`

docs/reference.md

@@ -6,7 +6,7 @@ Fuzzers are usually built with one or more  [sanitizer](https://github.com/googl
 You can select sanitizer configuration by specifying `$SANITIZER` build environment variable using `-e` option:
 
 ```bash
-python infra/helper.py build_fuzzers -e SANITIZER=undefined json
+python infra/helper.py build_fuzzers --sanitizer undefined json
 ```
 
 Supported sanitizers:

docs/reproducing.md

@@ -31,7 +31,7 @@ to replicate the exact build steps used by OSS-Fuzz and then feed the reproducer
 - *Reproduce using latest OSS-Fuzz build:* 
 
 ```bash
-$ python infra/helper.py build_fuzzers -e SANITIZER=<address/memory/undefined> $PROJECT_NAME
+$ python infra/helper.py build_fuzzers --sanitizer <address/memory/undefined> $PROJECT_NAME
 $ python infra/helper.py reproduce $PROJECT_NAME <fuzz_target_name> <testcase_path>
 ```
 
@@ -42,14 +42,14 @@ $ python infra/helper.py reproduce $PROJECT_NAME <fuzz_target_name> <testcase_pa
   and reproduce a crash testcase for a fuzzer named `libxml2_xml_read_memory_fuzzer`, it will be: 
 
 ```bash
-$ python infra/helper.py build_fuzzers -e SANITIZER=undefined libxml2
+$ python infra/helper.py build_fuzzers --sanitizer undefined libxml2
 $ python infra/helper.py reproduce libxml2 libxml2_xml_read_memory_fuzzer ~/Downloads/testcase
 ```
 
 - *Reproduce using local source checkout:*
 
 ```bash
-$ python infra/helper.py build_fuzzers -e SANITIZER=<address/memory/undefined> $PROJECT_NAME <source_path>
+$ python infra/helper.py build_fuzzers --sanitizer <address/memory/undefined> $PROJECT_NAME <source_path>
 $ python infra/helper.py reproduce $PROJECT_NAME <fuzz_target_name> <testcase_path>
 ```