Fix typos/grammar

docs/api/apple2-programming-guide.md

@@ -11,7 +11,7 @@ You can do it using [CiderPress](http://a2ciderpress.com/),
 [AppleCommander](https://applecommander.github.io/), 
 or some other tool.
 
-The file has to be loaded from $0C00. An example how to put such file onto a disk using AppleCommander:
+The file has to be loaded from $0C00. An example how to put such a file onto a disk using AppleCommander:
 
     java -jar AppleCommander-1.3.5.jar -p disk_image.dsk FILENAME B 0xc00 < compiler_output.a2
     

docs/api/command-line.md

@@ -31,7 +31,7 @@ no extension for BBC micro program file,
 Default: If compiling one file with `.mfk` extension, the same name as the input file. Otherwise, `a`.
 
 
-* `-s` – Generate also the assembly output. It is not compatible with any assembler, but it serves purely informational purpose. The file has the same nam as the output file and the extension is `.asm`.
+* `-s` – Generate also the assembly output. It is not compatible with any assembler, but it serves purely informational purpose. The file has the same nam as the output file, and the extension is `.asm`.
 
 * `-g` – Generate also the label file. The label file contains labels with their addresses, with duplicates removed.
 It can be loaded into the monitor of the emulator for debugging purposes.
@@ -59,7 +59,7 @@ Those directories are searched for modules and platform definitions.
 When searching for modules, the directory containing the file currently being compiled is also searched.
 When searching for platform definitions, the current working directory is also searched.
 If not given, the compiler will try to detect the default include directory.
-If given, then the compiler will NOT try to detect the default include directory and you will have to add it to the list yourself.
+If given, then the compiler will NOT try to detect the default include directory, and you will have to add it to the list yourself.
 
 * `-i <dir>` – Add a directory to the include directories.
 Unlike `-I`, this does not replace the default include directory and allows using directories with semicolons in their names. 

docs/api/cpc-programming-guide.md

@@ -8,7 +8,7 @@ You can do it using [CPCDiskXP](http://www.cpcwiki.eu/index.php/CPCDiskXP),
 [iDSK](http://www.cpcwiki.eu/index.php/IDSK), 
 or some other tool.
 
-The file has to be loaded from $0400. An example how to put such file onto a disk using CPCDiskXP:
+The file has to be loaded from $0400. An example how to put such a file onto a disk using CPCDiskXP:
 
     CPCDiskXP -File FILENAME -AddAmsdosHeader 0400 -AddToNewDsk disk_image.dsk
 

docs/api/famicom-programming-guide.md

@@ -36,7 +36,7 @@ The minimal Famicom program thus looks like this:
 To use a mapper of your choice, create a new `.ini` file with the definitions you need.
 The most important ones are `[output]format` and `[allocation]segments`.
 
-Currently, its a bit inconvenient to create programs using mappers that change the bank containing the interrupt vectors.
+Currently, it's a bit inconvenient to create programs using mappers that change the bank containing the interrupt vectors.
 Therefore, it's recommended to stick to mappers that have a fixed bank at the end of the address space.
 
 Mappers that should be fine: NROM (0), CNROM (1), UxROM(2), MMC2 (9), MMC3 (4), MMC4 (10), MMC6 (4).